RS9110-N-11-24 – 802.11bgn Self-Contained
WLAN Module with Networking Stack
Module Integration Guide
Redpine Signals, Inc.
2107 N. First Street, #680
San Jose, CA 95131.
Tel: (408) 748-3385
Fax: (408) 705-2019
Email: info@redpinesignals.com
Website: www.redpinesignals.com
Redpine Signals, Inc. Proprietary and Confidential
Module Integration Guide
Version 2.3, November, 2012
Part Numbers
Device Number
Description
RS9110-N-11-24
Part with UART as Host
Interface
RS9110-N-11-24-02
Part with SPI as Host
Interface
Errata/Changes:
Version
No
Corrections
2.1
Changed UART TX/RX pin connections
in MAX3232 part in UART schematics.
Pin 11 is UART TX, pin 12 is UART RX
2.2
Put correct name and value range of
the capacitor in Note in page 11,
point 1.
2.3
Added alternative connection for
crystal’s VDD
Redpine Signals, Inc. Proprietary and confidential
Page 2
Module Integration Guide
Version 2.3, November, 2012
Table of Contents
1 RS9110-N-11-24 (UART) Reference Schematics .................. 6
1.1
RS9110-N-11-24 (UART) Bill of Materials ............................. 7
2 RS9110-N-11-24-02 (SPI) Reference Schematics ................ 9
2.1
3
4
5
6
7
RS9110-N-11-24-02 (SPI) Bill of Materials ......................... 10
Reference Oscillator Specifications .................................... 13
Recommended Specifications for Schottky Diode .............. 15
RS9110-N-11-24 PCB Landing Pattern ............................... 16
Circuit and Layout Guidelines ............................................ 17
Antenna Layout Guidelines ................................................ 18
7.1
Antenna Matching Network ................................................. 19
8 u.FL Connector Recommendations ..................................... 21
Redpine Signals, Inc. Proprietary and confidential
Page 3
Module Integration Guide
Version 2.3, November, 2012
Table of Figures
PCB Landing Pattern for RS9110-N-11-24 ..................................................
Reference Antenna Layout .........................................................................
Antenna Matching Network ........................................................................
u.FL Connector ...........................................................................................
External Antenna .......................................................................................
Redpine Signals, Inc. Proprietary and confidential
16
18
20
21
21
Page 4
Module Integration Guide
Version 2.3, November, 2012
<This page has been intentionally left blank>
Redpine Signals, Inc. Proprietary and confidential
Page 5
RS9110-N-11-24 – 802.11bgn Self-Contained
WLAN Module with Networking Stack
Module Integration Guide
1 RS9110-N-11-24 (UART) Reference Schematics
U1
R9 33E
14
VDD_EXT
2
VRF28
2
FB9(N P)
1
21
3
BEAD
FB8
1
21
4
7C40000192
1
OUT OE
35
2
34
VDDGND
BEAD
RF_OUT
U5
NOTE::
Default : Mount FB8 & Do N ot M ount FB9.
If VDD _EXT is used
Mount FB9 & Do Not M ount FB8.
23
C54
2.2uF
8
9
10
13
12
11
R23**
1K to 10K
R23**
This value shoul d be
between 1K to 10K
46
47
48
49
WLAN_UAR T_TX
SLEEP_CLK_X1
1
Z3
TBD
NC
SPI_CLK
SPI_CS
SPI_M OSI
SD3
IN TR
SPI_M ISO
NC
ANT1
ANT2
VCC33
2
6
NC
NC
NC
NC
31
Tuning Network
50 Ohm RF line
LED
RS9110-N-11-24 LED_ON
18
19
21
22
WLAN_UAR T_R X
36
20
Reset_n
VIN BCKDC
UART_TX
UART_RX
NC
NC
VOUTBC KDC1P3
FBDC1P3
NC
NC
VIN LD OP123
Power_enabl e
VRF28
28
55
32
6
7
54
Mi cro C ontroll er
R19
0E
53
50
51
25
NC
NC
NC
NC
NC
NC
VRF33
VRF33
JNC
JPD0
JPD1
JPD2
NC
Z1 , Z2, Z3 for m the tuni ng network
for matchi ng the impedance of the
Antenna. The values depend upon the
layout. In case tuning networ k is not
impl emented Z1 should be pl aced as
8.2pF as default
C11
10uF
17
PB1
LED_ON
VOUT
VON/OFF
5
2
3
4
NC
GND
R18
C1
0.1uF
GND
GND
GND
GND
GND
GND
VMOD
R43
2K
R16
100K
820E
Power Switch
Optional
VMOD
CMS0 2
C10
10uF
Power Supply Filter Section
FB6
VRF28
2
2
1
1
VRF33
BEAD
C7
10uF( Case B)
Tantalum
VRF33
R24
1K
L7
VMOD
29
33
42
41
40
1
C23
0.1uF
FB1
2
4.7uH
C16
22uF( Case B)
Tantalum
16
26
30
45
56
58
RESET_n
NC
NC
NC
NC
NC
NC
2
b
1
R2
FDC6329L
39
43
44
a
VIN
5
37
52
1
2
C36
0.1uF
VDD_EXT
DVD33
D2
3
D3
27
38
C34
VOUT
4
R14
10K(NP)
NC
R17 100K
15
24
1000pF
R1,C 1
R15
20K
Z2
TBD
XTAL_EN
DVDD 33
uC_UART_RX
uC_UART_TX
VMOD
U3
57
Power_enabl e
DPDT(OPTIONAL)
J1
ANT1
Z1
TBD
REF_CLK
C6
0.1uF
2
1
1
BEAD
DVDD33
C17
10uF
FB5
2
2
1
1
VDD_EXT
BEAD
C9
1uF
VIN33
FB7
2
2
1
1
BEAD
Op tional Power-On Reset
for DEBUG purpose
NOTE::If required C7 can be increased to
22uF f or f urther improving the Transmit
EVM
VCC33
C24
0.1uF
UART Circuitry
VIN3 3
C20
0.1uF
2
1
C21
0.1uF
3
4
C22
0.1uF
5
6
7
8
C18
0.1uF
U4
V+
VCC
GND
16
15
C19
0.1uF
P1
C1+
C1C2+
C2-
T1OUT
R1IN
R1OUT
T1IN
VT2OUT
T2IN
R2IN
R2OUT
14
13
12
11
10
9
DB9_TXD
DB9_RXD
WLAN_UAR T_R X
WLAN_UAR T_TX
UART_RX
UART_TX
DB9_RXD
DB9_TXD
5
9
4
8
3
7
2
6
1
DB9_FEMALE
Title
MAX3232CDBR
RS9110 - N - 11 - 24 Re fere nce Design - UART
OPTIONAL
Size
Document Number
Custom
Date:
Redpine Signals, Inc. Proprietary and Confidential
Monday, October 29, 2012
Rev
Sheet
1
of
1
Module Integration Guide
1.1 RS9110-N-11-24 (UART) Bill of Materials
Item
Qty
Reference
1
3
C6,C23,C24
2
1
C9
3
1
4
2
5
Description
Part Value
Jedec
Mfg/
Part No
CAPACITORS
0.1uF
CER CHIP C 0.1U 10% X5R 0402 10V
0402
1uF
CAP CER 1.0UF 16V 10% X7R 0805
0805
Murata
C54
2.2uF
CER CHIP C 2.2U 20% X5R 0402 4V
0402
Murata
GRM155R60G225ME15D
C10,C17
10uF
CER CHIP C 10U 20% X5R 0805 10V
0805
Murata
GRM21BR61A106KE19L
1
C7
10uF
CER CHIP C 10U 10% EIA CASE B 6.3V
CASE-B
AVX
TAJB106K006RNJ
6
1
C16
22uF
CER CHIP C 22U 20% EIA CASE B 6.3V
CASE-B
Kemet
B45196H1226M209
7
1
R19
8
1
R9
Murata
GRM155R61A104KA01D
GRM21BR71C105KA01L
RESISTORS
0E
CHIP RES 0.0R 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GE0R00X
33E
CHIP RES 33R 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GEJ330X
CHIP RES 820 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GEJ821X
RES 1.0K OHM 1/16W 5% 0402 SMD
0402
Yageo
RC0402JR-071KL
9
1
R18
820E
10
1
R24
1K
11
1
R23**
1K to 10K
INDUCTORS
12
1
L7
4.7uH
Power Inductor
SMD
FDK
MIPF2520D4R7
13
5
FB1,FB5,FB6,FB7,FB8,
BEAD
Chip Ferrite Beads
0805
Murata
BLM21PG221SN1D
14
1
D2
CMS02
Schottky Diode
SMD
Toshiba
CMS02TE12L,Q
15
1
D3
LED
Green LED
0603
Lite-On Inc
LTST-C190KGKT
16
1
Z1,Z2,Z3
TBD
Refer to the description in the schematic.
Sample part number for Z1 given here.
Murata
GRM1555C1H8R2CZ01D
17
1
U1
18
1
U5
19
1
ANT1
2.45GHz SMD Antenna
20
1
J1
Microcontroller Header
21
1
C34
1000pF
CER CHIP C 1nF +/-10% X7R 0402 50V
0402
Murata
GRM155R71H102KA01D
22
7
C1,C18,C19,C20,C21,C22,C36
0.1uF
CER CHP C 8.2P +-0.25P C0G 0402 50V
0402
Murata
GRM1555C1H8R2CZ01D
23
1
C11
10uF
CER CHIP C 10U 20% X5R 0805 10V
0805
Murata
GRM21BR61A106KE19L
DIODES
ANTENNA TUNING NETWORK
IC'S
RS-24
802.11bgn WLAN Module
LGA
Redpine
RS9110-N-11-24
7C40000192 40 MHz Crystal Oscillator
SMD
TXC
7C40000192
SMD
Antenna Factor
ANT-2.45-CHP-T
Burg
Do Not Populate
Redpine Signals, Inc. Proprietary and confidential
Page 7
Module Integration Guide
24
1
R43
2K
CHIP RES 2K 1% 100PPM 0402 1/10W
0402
Panasonic
ERJ-2RKF2001X
25
1
R14
26
1
R15
10K
CHIP RES 10K 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GEJ103X
20K
CHIP RES 20K 1% 100PPM 0402 1/16W
0402
Yageo
27
2
R16,R17
RC0402FR-0720KL
CHIP RES 100K 5% 200PPM 0402 1/10W
0402
Panasonic
28
1
U3
FDC6329L
ERJ-2GEJ104X
Fairchild Semi.
FDC6329L
29
1
U4
RS232
30
1
PB1
2 Pin headers
Texas Instr.
MAX3232CDBR
31
1
P1
CONNECTOR DB9_FEMALE PCB Mount
32
1
SW1
33
1
FB9
100K
DC-DC Switch
SSOT-6
UART Level Shifter
SSOP
Burg
DPDT
BEAD
Chip Ferrite Beads
Redpine Signals, Inc. Proprietary and confidential
0805
Page 8
CTS Corp.
204-221ST
Murata
BLM21PG221SN1D
Module Integration Guide
2 RS9110-N-11-24-02 (SPI) Reference Schematics
NOTE::
Default : Mount FB8 & Do N ot M ount FB9.
If VDD _EXT is used
Mount FB9 & Do Not M ount FB8.
Power Switch Optional
R8 33E
3
OUT OE
U1
1
14
FB8
2
VRF28
21
1
BEAD
FB9(N P)
2
1
21
VDD_EXT
4
VDDGND
2
RF_OUT
U6
35
C54
2.2uF
34
BEAD
J1
SPI_CLK
SPI_CS
SPI_M OSI
SPI_M ISO
IN TR
Reset
Power_enabl e
Mi cro C ontroll er
1000pF
23
R23**
8
9
10
11
12
13
R23**
This value shoul d be
adjusted based on dr iver
output i mpedance and PCB
Tr ace Impedance,,( 33E is
Nomi nal )
46
47
48
49
36
20
Z3
TBD
SPI_CLK
SPI_CS
SPI_M OSI
SPI_M ISO
IN TR
SD3
NC
50
3.9K to 4.75K
51
R18
25
15
R19
VMOD
100K
C1
0.1uF
Z1 , Z2, Z3 for m the tuni ng network for matching
the i mpedance of the Antenna. The values depend
upon the layout. In case tuning networ k is not
impl emented Z1 should be pl aced as 8.2pF as
default
31
Tuning Network
D3
LED_ON
C35
10uF
VIN BCKDC
UART_TX
UART_RX
VOUTBC KDC1P3
NC
RS9110-N-11-24
NC
FBDC1P3
NC
NC
VIN LD OP123
3
PB1
2
1
a
2
b
VMO D
VIN
C36
0.1uF
R14
10K(NP)
5
R13
VON/OFF
R2
1
R43
2K
VDD_EXT
820E
27
VMOD
37
38
VOUT
FDC6329L
LED
DVD33
VOUT
4
R16
100K
24
17
R1,C 1
R15
20K
50 Ohm RF line
NC
NC
NC
NC
D2
CMS0 2
Power Supply Filter Section
C10
10uF
FB6
39
2
52
2
1
1
BEAD
VRF28
VRF33
C7
C23
0.1uF
10uF (C ase B)
Tantalum
NC
NC
NC
NC
NC
NC
VRF33
VRF33
JNC
JPD0
JPD1
JPD2
NC
43
44
MO DE_SEL_1
GND
NC
NC
NC
NC
NC
NC
L7
VRF33
5
2
3
4
VMOD
1K
FB1
2
4.7uH
C16
22uF (C ase B)
Tantalum
C6
0.1uF
2
1
1
DVDD33
BEAD
C17
10uF
R20
NC
RESET_n
2
Power_enable
GND
GND
GND
GND
GND
GND
53
ANT2
29
33
42
41
40
1
FB5
2
1
1
VDD_EXT
C9
1uF
VIN33
FB7
2
2
1
1
BEAD
Op tional Power-On Reset
for DEBUG purpose
NOTE::If required C7 can be increased to
22uF f or f urther improving the Transmit
EVM
Redpine Signals Confidential
Page 9
VCC33
C24
0.1uF
Title
RS9110 - N - 11 - 24 Reference Design - SPI
Size
Document Number
Custom
Date:
Redpine Signals, Inc. Proprietary and confidential
2
BEAD
16
26
30
45
56
58
R17
0E
ANT1
C34
U3
Z2
TBD
XTAL_EN
VRF28
28
55
32
6
7
54
1
NC
VCC33
6
57
SLEEP_CLK_X1
DVDD 33
18
19
21
22
ANT1
Z1
TBD
REF_CLK
Monday, October 29, 2012
Rev
Sheet
1
of
1
Module Integration Guide
2.1 RS9110-N-11-24-02 (SPI) Bill of Materials
Item
Qty
Reference
1
3
C6,C23,C24
2
1
C9
3
1
4
2
5
Description
Part Value
Jedec
Mfg
Part No
CAPACITORS
0.1uF
CER CHIP C 0.1U 10% X5R 0402 10V
0402
1uF
CAP CER 1.0UF 16V 10% X7R 0805
0805
Murata
C54
2.2uF
CER CHIP C 2.2U 20% X5R 0402 4V
0402
Murata
GRM155R60G225ME15D
C10,C17
10uF
CER CHIP C 10U 20% X5R 0805 10V
0805
Murata
GRM21BR61A106KE19L
1
C7
10uF
CER CHIP C 10U 10% EIA CASE B 6.3V
CASE-B
AVX
TAJB106K006RNJ
6
1
C16
22uF
CER CHIP C 22U 20% EIA CASE B 6.3V
CASE-B
Kemet
B45196H1226M209
7
1
R17
8
2
R8,R23**
Murata
GRM155R61A104KA01D
GRM21BR71C105KA01L
RESISTORS
0E
CHIP RES 0.0R 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GE0R00X
33E
CHIP RES 33R 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GEJ330X
CHIP RES 820 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GEJ821X
RES 1.0K OHM 1/16W 5% 0402 SMD
0402
Yageo
RC0402JR-071KL
9
1
R13
820E
10
1
R20
1K
11
1
R18
3.9K to 4.75K
INDUCTORS
12
1
L7
4.7uH
Power Inductor
SMD
FDK
MIPF2520D4R7
13
5
FB1,FB5,FB6,FB7,FB8
BEAD
Chip Ferrite Beads
0805
Murata
BLM21PG221SN1D
14
1
D2
CMS02
Schottky Diode
SMD
Toshiba
CMS02TE12L,Q
15
1
D3
LED
Green LED
0603
Lite-On Inc
LTST-C190KGKT
16
1
TBD
Refer to the description in the schematic.
Sample part number for Z1 given here.
Murata
GRM1555C1H8R2CZ01D
DIODES
ANTENNA TUNING NETWORK
Z1,Z2,Z3
IC'S
17
1
U1
18
1
U6
802.11bgn WLAN Module
LGA
Redpine
RS9110-N-11-24
7C40000192 40 MHz Crystal Oscillator
RS-24
SMD
TXC
19
1
ANT1
2.45GHz SMD Antenna
7C40000192
SMD
Antenna Factor
20
1
J1
Microcontroller Header
ANT-2.45-CHP-T
21
1
C34
Burg
Do Not Populate
1000pF
CER CHIP C 1nF +/-10% X7R 0402 50V
Redpine Signals, Inc. Proprietary and confidential
Page 10
0402
Murata
GRM155R71H102KA01D
Module Integration Guide
22
2
C1,C36
0.1uF
CER CHP C 8.2P +-0.25P C0G 0402 50V
0402
Murata
GRM1555C1H8R2CZ01D
23
1
C35
10uF
CER CHIP C 10U 20% X5R 0805 10V
0805
Murata
GRM21BR61A106KE19L
24
1
R43
2K
CHIP RES 2K 1% 100PPM 0402 1/10W
0402
Panasonic
ERJ-2RKF2001X
25
1
R14
10K
CHIP RES 10K 5% 200PPM 0402 1/10W
0402
Panasonic
ERJ-2GEJ103X
26
1
R15
20K
CHIP RES 20K 1% 100PPM 0402 1/16W
0402
Yageo
RC0402FR-0720KL
27
2
R16,R19
0402
Panasonic
ERJ-2GEJ104X
28
1
U3
Fairchild Semi.
FDC6329L
29
1
PB1
30
1
FB9
100K
FDC6329L
CHIP RES 100K 5% 200PPM 0402 1/10W
DC-DC Switch
SSOT-6
2 Pin headers
BEAD
Burg
Chip Ferrite Beads
0805
Murata
BLM21PG221SN1D
NOTE:
1.The Power Switch section in the Reference Schematics is shown for guidance to the PCB designer in case the
usage of such a part is required in the system. C34 in the schematic above may range from 100pF to 1uF to allow
for a transient inrush current when the module is powered on ( a worst-case maximum of 800mA for a maximum of
40 usec). Alternatively, a capacitor ranging from 100uF to 400uf can be used at the output of the power supply,
depending on the current sourcing capabilities of the power supply. The values recommended here include a
reasonable safety margin as well.
2. The design of the system should provide for a peak current load of 325mA, which can be sustained when the
module is transmitting at the highest physical data rate and highest RF output power. The number indicated here
includes a safety margin as well.
3. For SPI modules, based on the Host SPI configuration, during BOOT UP, SPI Master in the Host could be coming
up as GPIO pins. In the wake of this possibility, it may be necessary to add a pull up on the module’s SPI_CS and a
pull up (CPOL=1)/pull down(CPOL=0) on the SPI_CLK. The value of pull up/ pull down resistor should follow the
recommendations as given on the HOST side.
Signal Integrity Guidelines for SPI interface: Glitches in the SPI clock can potentially take the SPI interface out of
synchronization. The quality and integrity of the clock line needs to be maintained. The following steps are
recommended. Please note that this is not an exhaustive list of guidelines and depending on individual cases
additional steps may be needed.
1. It is recommended to avoid using cables to connect the Host platform with the module’s SPI interface. In case a
cable is used, minimize the length of the SPI bus cable to as small as possible, preferably to within an inch or two
2. It is recommended to use a companion card with a rigid connector to the host
Redpine Signals, Inc. Proprietary and confidential
Page 11
Module Integration Guide
3. If a cable is used, increase the number of ground connections between the WiFi PCB and the MCU PCB
4. Add a series resistor into the clock line. Choice of value is mentioned in the Module Integration Guide.
5. If the SPI clock line is mapped to a programmable I/O on the MCU, configure that I/O to an output with as high a
drive as is available.
6. Ensure that the Wi-Fi board's reset input is mapped to a MCU controllable line, so that the system can recover
through a hard reset.
Redpine Signals, Inc. Proprietary and confidential
Page 12
RS9110-N-11-24 – 802.11bgn Self-Contained
WLAN Module with Networking Stack
Module Integration Guide
3 Reference Oscillator Specifications
Parameter
Specifications
Units
Comments
Nominal Frequency
40
MHz
Frequency Accuracy
± 20
PPM
Over operational
temperature at rated
voltage.
Supply Voltage (VDD)
2.8 ± 10%
or
3.3 ± 10%
V
Power supply should
ideally be locally
regulated, and with
adequate filtering.
Power Supply PSRR
> 60
dB
-40 to + 85
°C
Output Voltage ‘0’ level
< 10% of VDD
V
Output Voltage ‘1’ level
> 90% of VDD
V
Output type
Square Wave
Operational Temperature
Duty cycle
45 to 55
%
< 10
ns
30 ps pk-pk
ps
Wake-up time from Standby
<1
ms
Wake-up time from power-on
<5
ms
Standby current
< 20
uA
Active current
< 10
mA
Output load
> 15
pF
Rise time/Fall time
Jitter
Phase Noise at offset:
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
For industrial grade
products.
Typical.
< -89
< -121
< -135
< -146
< - 150
dBc/Hz
Note: Before finalizing the choice of a crystal oscillator, it is advisable to carry
out detailed EVM measurements on a prototype or evaluation board.
List of Recommended Crystal Oscillators
1. TXC part number 7C40000192
Redpine Signals, Inc. Proprietary and Confidential
Module Integration Guide
2. Ecera part number FD4000113
3. Fox Xpresso part number FXO-HC538R
4. Kyocera part number KC25200C40C3KE00
5. Tai-Saw Technology part number TW0377E
6. Epson Toyocom part number SG 150-SCE
7. Epson Toyocom part number SG 211-SCE
8. Golledge part number GXO-5332L/E 40.0MHz
9. ECS part number EC-2532HS
Note: Before finalizing the choice of a crystal oscillator, it is advisable to
carry out detailed EVM measurements on a prototype or evaluation
board.
If the user is using WiFi in proximity to a cellular network, it is
recommended that a BPF should be used at the output of the RF.
Although this depends on the user’s choice and requirements, part
number DEA162450BT-1210A1 from TDK could be considered.
Redpine Signals, Inc. Proprietary and confidential
Page 14
Module Integration Guide
4 Recommended Specifications for Schottky Diode
a. Forward voltage: VFM = 0.40 V (max)
b. Average forward current: IF (AV) = 3.0 A
c. Repetitive peak reverse voltage: VRRM = 30 V
Recommended Parts
a. Toshiba part number CMS02
b. NXP part number PMEG3030BEP
Redpine Signals, Inc. Proprietary and confidential
Page 15
Module Integration Guide
5
RS9110-N-11-24 PCB Landing Pattern
PCB Landing Pattern for RS9110-N-11-24
Redpine Signals, Inc. Proprietary and confidential
Page 16
Module Integration Guide
6 Circuit and Layout Guidelines
The following are guidelines for integrating the RS9110-N-11-24 module into a
wireless LAN solution.
1. The module has a central ground pad of size 2.5mm x 2.5mm. An
application’s layout must have a provision to include this.
a. Please provide a 2.7 mm X 2.7 mm Copper pad on the Top side
of the application board. Please open the solder mask in this
area so that the Cu is exposed.
b. Please provide a 2.7 mm X 2.7 mm or higher Copper pad on the
bottom side of the application board. Please open the solder
mask in this area so that the Cu is exposed.
c. Please provide at least 12 via’s to connect these pads to the
Ground plane. We recommend that the via’s should be at least
10 mil x 18 mil.
2. The reference schematics shown in the previous section include the
recommended power supply filtering and decoupling.
3. For RESET one of the two options should be followed
a. The RESET can be Host driven. At the time of Power-on,
Please ensure that the reset is held low for 20mSec or more.
After this the reset should be driven high
b. Reset may be driven by an R-C circuit. The recommended
value of ‘R’ is 100 Kohms and the recommended value of ‘C’
is 0.1uF
It is strongly recommended that the reset is host driven because
hardware reset is the safest way to recover the module from an
unknown state during its operation.
4. The RF trace on RF_OUT should have a characteristic impedance of 50
ohms. They can use any standard 50 RF trace (Microstrip or Coplanar
wave guide). The width of the 50 ohms line depends on their PCB stack
like the dielectric of the PCB, thickness of the copper, thickness of
dielectric & etc. Customers can work with their fab in this regard.
5. CLK_REF is the reference clock to the module and should therefore be
routed with minimum trace length and should be routed away from
other switching or sensitive traces.
Redpine Signals, Inc. Proprietary and confidential
Page 17
Module Integration Guide
7 Antenna Layout Guidelines
The choice of antenna will depend on the application. However, some
recommendations are listed below if a chip antenna is desired to be used :
d. Rainsun AN3216
e. Rainsun AN1003
f.
Antenna Factor ANT-2.45-CHP or equivalent.
Please make sure that the Cu is etched out in all the Layers in the Antenna
region, if a chip antenna is mounted. The Ground plane should be removed
from under & either sides of the antenna. Please follow the rules listed in
the picture below while doing the layout for the chip Antenna. Removing
the ground plane from the underneath the antenna is very important.
Reference Antenna Layout
Additional recommendations for antenna Layout:
The chosen chip Antennae are /4 antennae and would require external ground
plane for proper functioning and the length of the ground plane behind the
antenna (from the feedpoint of antenna to backwards) should be minimum 1 inch.
The antenna feed trace length of 3mm (copper etched part of the trace) shown in
the figure, is not required if the reference design has sufficient ground plane
behind the antenna. In this scenario the antenna feed trace can be as small as
Redpine Signals, Inc. Proprietary and confidential
Page 18
Module Integration Guide
zero mm (copper etched part of the trace) as long as the antenna feed point is not
placed on the ground plane.
The antenna feed trace on the copper etched portion can be made longer than
zero mm (As an example the 3mm shown in the figure), if the ground plane
behind the antenna is less than the recommended length. This longer length in
the copper etched portion running through the antenna feed point becomes the
resonant part of the antenna and lowers its frequency. This can be a useful tuning
method for the return loss.
Electrical performance of any Chip antenna is influenced by the physical
characteristics of the surrounding ground plane, feed line, other devices, and
materials. This can be used as an advantage by manipulating certain parameters
to affect resonant frequency and match:
1. Ground plane configuration
2. Distance from antenna
3. Topology around antenna
4. Feed point transmission line impedance
5. Trace width
6. Trace length
7. Matching Network
8. PCB substrate thickness
9. PCB substrate dielectric constant.
Note: The board designer should characterize the return loss of the
antenna portion using a Network Analyzer before base line of the design.
7.1 Antenna Matching Network
Provision should be given for a pi network as shown in the schematics. The
values shown below are illustration purposed. The values of the pi network
components depend on the antenna part, customer’s layout, ground plane
in the layout & other components in the system which could affect the
radiation pattern of the antenna. Please use a Network Analyzer to
optimize the values of the match network for the best return loss.
Redpine Signals, Inc. Proprietary and confidential
Page 19
Module Integration Guide
ANT
RF IN
L=3nHto3.9nH
C=1.5pFto3pF
Ground Plane
ANT
RF IN
C=1.5pFto3pF
L=3nHto3.9nH
Ground Plane
Antenna Matching Network
The radiation pattern of the Antenna can be studied in an Anechoic Chamber using
a Network Analyzer & a Horn Standard Gain Antenna
Redpine Signals, Inc. Proprietary and confidential
Page 20
Module Integration Guide
8 u.FL Connector Recommendations
u.FL Connector
External Antenna
This section is for the user who wants to use a uFL connector for external
antenna. The figures show the uFL connector. The connector on the
external antenna should be pushed down to fit into the U.FL connector
connected to the module. Some reference part numbers for external
antenna are given below. This is for general guidance only, as the choice of
the antenna will depend on the application.
Manufacturer
Part No
Laird Technologies
0600-00040
Digi International
Connectblue
Connectblue
A24-HABUF-P5I
cB-ACC-27
cB-ACC-29
*****
Redpine Signals, Inc. Proprietary and confidential
Page 21