STMicroelectronics Quad half-bridge and single high-side driver Datasheet
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L9947
QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER
LOW CONSUMPTION IN STANDBY MODE
(<100
µ
A AT ROM TEMP; < 150
µ
A AT 130°C)
TWO HALF BRIDGES FOR 3A LOAD
(R
DSON
= 0.25
Ω
TYP; T j
= 25
°
C)
TWO HALF BRIDGES FOR 0.5A LOAD
(R
DSON
= 2.5
Ω
TYP; T j
= 25
°
C)
HIGH SIDE DRIVER FOR 2.5A LOAD
(R
DSON
= 0.45
Ω
TYP; T j
= 25
°
C)
DIRECT CONTROLLED BY
µ
C (MULTIPLEX
SYSTEM)
OUTPUT HIGH/LOW LEVEL DIAGNOSTIC
OVERCURRENT SWITCH OFF AND DIAG-
NOSTIC
OVERTEMPERATURE DIAGNOSTIC BE-
FORE SWITCH OFF
OPEN LOAD DIAGNOSTIC
DESCRIPTION
The L9947 is a bus controlled power interface in-
BLOCK DIAGRAM
Multiwatt 15
ORDERING NUMBER: L9947S tended for automotive applications realized in multipower BCD60II technology. Up to three DC motors and one grounded resistive load can be driven with its four half-bridge and one high-side driver power outputs. The microcomputer compatible bidirectional parallel bus allows several interfaces connected on the same bus (multiplex system). The full diagnostic information is available on the bus.
Obsolete Product(s) - Obsolete Product(s)
November 2001 1/13
L9947
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
I
S
V
CC
V
CSN
, V
R/WN
V
MODE
V
D0 -D3
I
OUT1 - OUT5
T j
T j - SD
T j - HYS
DC Supply Voltage
Single Pulse t max
< 400ms
Negative Supply Current
Stabilized Supply Voltage
Digital Input Voltage
Parameter
Digital Input/ Output Voltage
Output Current Power
Operating Junction Temperature
Thermal Shutdown Junction Temperature
Thermal Junction Temperature Hysteresis
PIN CONNECTION
Value
26
40
-9
-0.3 to 6V
-0.3 to V
CC
+0.3
-0.3 to V
CC
+0.3
internal limited
-40 to 150 min 150
20
Unit
V
V
A
V
V
V
°
C
°
C
K
THERMAL DATA
Obsolete Product(s) - Obsolete Product(s)
R th j-amb
Parameter Value Unit
Thermal Resistance Junction Ambient P tot
= 25W; free air; DC 38
°
C/W
°
C/W Z th j-amb
10 single pulse tp = 20s
2/13
L9947
ELECTRICAL CHARACTERISTICS (V
S
= 8 to 16V; V
CC
= 4.5 to 5.5V; T j
= -40 to 150
°
C;unless otherwise specified; the voltage are refered to GND and currents are assumed positive, when the current flows into the pin.)
SUPPLY:
Min.
Max.
Symbol
I
CC
I
S
I
CC + IS
Parameter
DC Supply Current
DC Supply Current
Sum Supply Current
(1)
Test Condition
V
S
= 16V; V
CC
= 5.5V; (status 8)
V
S
= 16V; V
CC
= 5.5V; (status 8)
I
OUT1
= I
OUT2
= I
OUT3
= I
OUT4 =
I
OUT5
= 0; Standby (status 2)
V
S
= 14V; V
CC
T j
= 5.5V;
= -40 to 25
°
C
I
OUT1
= I
OUT2
= I
OUT3
= I
OUT4 =
I
OUT5
= 0; Standby (status 2)
V
S
T j
= 14V; V
> 25
°
C
CC
= 5.5V;
V
S
< 14V; V
CC
= 5.5V; I
OUT
= 0;
(status 17);
Typ.
5
10
100
150
3
Unit mA mA
µ
A
µ
A mA
V
SOVT
Overvoltage Shutdown
Threshold
CONTROL INPUTS: CNS, R/WN, MODE
17 25 V
Symbol
V
INL
V
INH
V
INHyst
I
INL
I
INH
R CSN
Parameter
Input Low Level
Input High Level
Input Hysteresis
Input Current Low
Input Current High (with exception of CSN Input)
Input Resistance to GND (pull down at CSN pin)
DATA INPUT: D0 - D3
Test Condition
V
CC
= 5V
V
CC
= 5V
V
CC
= 5V;
V
CC
= 5V; V
IN
= 0
V
CC
= 5V; V
IN
= 5V
Min.
3.5
0.5
-10
-10
20
Typ.
Max.
1.5
10
10
Unit
V
V
V
µ
A
µ
A
K
Ω
Symbol
V
DINL
V
DINH
V
DINHyst
I
DINL
I
DINH
Parameter
Input Low Level
Input High Level
Input Hysteresis
Input Current Low
Input Current High
DATA OUTPUT: D0 - D3
Symbol
V
DOL
Parameter
Test Condition
V
CC
= 5V; MODE = 0
V
CC
= 5V; MODE = 0
V
CC
= 5V; MODE = 0
V
CC
= 5V; V
IN
= 0
V
CC
= 5V; V
IN
= 5V
Test Condition
V
CC
= 5V; I
D
= 0.5mA; MODE
Min.
3.5
0.5
-10
-10
Min.
Typ.
Typ.
Max.
1.5
10
10
Max.
0.6
Unit
V
V
V
µ
A
µ
A
Unit
V
V
DINH
V
CC
= 5V; I
D
= 0.5mA; MODE 4 V Input High Level
= 1 Obsolete Product(s) - Obsolete Product(s)
Note (1): Off-State Leakage Current of each single output
≤
25
µ
A, T j
= -40 to 150°C.
3/13
L9947
ELECTRICAL CHARACTERISTICS (continued)
OUTPUTS:
Symbol
R ON OUT1
R ON OUT2
R ON OUT3
R
ON OUT4
R
ON OUT5
Parameter
On Resistance to Supply or
GND
On Resistance to Supply or
GND
On Resistance to Supply or
GND
On Resistance to Supply or
GND
On Resistance to Supply
Test Condition
I
V
S
= 8V; T j
OUT
=
±
0.5A
= 125
°
C;
I
V
S
>10V; T j
= 125
°
C;
OUT
=
±
0.5A
I
V
S
= 8V; T j
OUT
=
±
0.5A
= 125
°
C;
V
S
> 10V; T
I
OUT
=
±
0.5A
j
= 125
°
C;
I
V
S
= 8V; T j
OUT
=
±
2.5A
= 125
°
C;
V
S
> 10V; T
I
OUT
=
±
2.5A
j
= 125
°
C;
I
V
S
= 8V; T j
OUT
=
±
2.5A
= 125
°
C;
V
S
> 10V; T
I
OUT
=
±
2.5A
j
= 125
°
C;
V
S
= 8V; T j
= 125
°
C; I
OUT
= -2A
V
S
> 10V; T j
= 125
°
C;
I
OUT
= -2A
For the function of the short circuit current limitation see the functional description (pag....)
Min.
Typ.
Max.
6
3.95
6
3.95
600
395
600
395
1.0
0.7
Unit
Ω
Ω
Ω
Ω m
Ω m
Ω m
Ω m
Ω
Ω
Ω
|I
OUT1
|
|I
OUT2
|
|I
OUT3
|
|I
OUT4
|
Output Current Limitation to
Supply or GND
Output Current Limitation to
Supply or GND
Output Current Limitation to
Supply or GND
Output Current Limitation to
Supply or GND
0.67
0.67
4
4
2
2
12
12
A
A
A
A
|I
OUT5
|
I
OUT1
I
OUtT2
I
OUT3
I
OUT4
Output Current Limitation to GND
Output Current
Output Current
Output Current
Output Current
V
OUT1
=2.5V; (status 18)
V
OUT2
=2.5V; (status 18)
V
OUT3
=2.5V; (status 18)
V
OUT4
=2.5V; (status 17)
V
OUT4
=V
S
-2.5V; (status 16 or 18)
V
OUT5
=V
S
-2.5V; (status 18)
2.5
5
5
5
80
-80
7.5
15
15
15
500
-500
A mA mA mA mA mA
I
OUT5
Output Current -5 -15 mA
V
OUT1-5
Output Voltage Detection
Thresholds
V
S
=13V; (status 11)
LOW
HIGH
HYSTERESIS
4.9
7.5
0.4 V
S
0.6 V
S
0.2 V
S
5.5
8.1
V
V
V status 12 - 15 130 T
JOT
°
C steady state t >20ms 125 <T
JSD
°
C t
ISC f
OSC
Overcurrent Switch off Time
Internal Oscillator Frequency
50
250
µ s
KHz
4/13
APPLICATION CIRCUIT DIAGRAM
Fogure 1: Recommended Application Circuit.
L9947
Obsolete Product(s) - Obsolete Product(s)
FUNCTIONAL DESCRIPTION
The L9947 is a power interface circuit designed for a multiplex system controlled by a parallel
µ
C bus. The bus consists of four bidirectional data wires D0 - D3 and three control wires read/write
(R/WN), mode (MODE) and chip select (CSN).
The device needs two supply voltages. The first voltage supplies the half bridges, high side driver and its driving part. The second one is a 5V stabilized supply. The function of the device in the typical operating modes is described in the following tables.
5/13
L9947
Output Activating/write Table 1
Status CSN R/WN MODE D0 D1 D2 D3 OUT1 OUT2 OUT3 OUT4 OUT5
1 1 X X X X X X AB AB AB AB AB
FUNCTION
Hold output behavious as programmed before
2
3
4
5
6
7
8
9
10
_
_
_
_
_
_
_
_
_
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
1
T
SRC
SNK
T
T
T
T
SNK
T
T
T
T
SRC
SNK
T
T
SNK
T
T
T
T
T
T
SRC
SNK
SNK
T
T
SNK
SRC
SNK
SRC
SNK
SRC
SNK
T
T
T
T
T
T
T
T
T
SRC
All Outputs, Standby mode
M1, right
M1, left
M2, right
M2, left
M3, right
M3, left
Braking
High side driver
Notes:
Where CSN = 0 the device is (for t
≤
100
µ s) transparent, in this condition any change of Data D0 .... D3 will lead to the apprpriate output response.
Deselecting the circuit (CSN ) the last programmed status will be stored.
Diagnostic / read. Table 2:
In readout modes the port D0 .... D3 is acting as an output showing the conditions detected before.
Status
11
12
13
14
15
CSN
_
_
_
_
_
R/WN MODE
1 0
1
1
1
1
1
1
1
1
D0
OUT1
0
1
0
1
D1 D2 D3
OUT2 OUT3 OUT4
0
0
1
1
OT
OT
OT
OT
OUT5
OUT5
Function
OUT1, OUT2, OUT3, OUT4;
• No failure, OT, OUT5;
OUT5 • OVC1, OT, OUT5;
OUT5 • OVC2, OT, OUT5;
OVV or OVV + OVC1 or OVV + OVC2
OT, OUT5;
Diagnostic / write. Table 3:
Diagnostic modes are used to check the load status for broken or shorted wires.
Status CSN R/WN MODE D0 D1 D2 D3 OUT1 OUT2 OUT3 OUT4 OUT5
16
_
0 1 0 1 0 X T T T 140mA
SRC
T
17
_
0 1 1 0 0 X T T T 140mA
SNK
T
18
_
0 1 0 1 1 X 10mA
SNK
10mA
SNK
10mA
SNK
140mA
SRC
10mA
SRC
Function
I s
+I cc
≤
1mA for I
OUT4
= 0
Standby and clear / write. Table 4: Obsolete Product(s) - Obsolete Product(s)
Status CSN R/WN MODE D0 D1 D2 D3 OUT1 OUT2 OUT3 OUT4 OUT5 Function
_
0 0 1 1 1 1 T T T T T Clear
20 0 X X X X X X T T T T T Clear, Static CSN = 0 will force clear status and standby after 100
µ s without respect of data inputs
Symbols:
1: Logic High
0: Logic Low
T: Tristate
X: Don’t care
6/13
AB: As before
_
Low pulse t < 100
µ s
SRC: Source
SNK: Sink
OT: Overtemperature
OVC1: Overcurrent 1
OVC2: Overcurrent 2
OVV: Overvoltage
OUTX:
- High if output voltage
was >0.6V
s
during test
- Low if output voltage
was < 0.4V
s
during test
Figure 2: System Startup Sequence
L9947
Obsolete Product(s) - Obsolete Product(s)
SYSTEM STARTUP (figure 2)
It is not mandatory that V S is present before V CC .
With the presence of the V
CC
the internal logic would be reseted and the system restarts under control of the inputs. If CSN = 0 for more than
100
µ s after the presence of V
CC
the standby mode is activated. Standby is also activated when the CSN and VCC would be high at the same time. When CSN = 0 and V CC goes up, the device is not controlled by the bus. The outputs remain in tristate but the current consumption is larger than
100
µ
A. A high - low - signal at the CSN - wire is mandatory to control the outputs. There is no undervoltage detection level for the supply voltage
VS implemented. The VCC should be supplied from the same voltage supply as the driver of the
D0 -D3 pins (eg.
µ
C).
7/13
L9947
DATA TRANSFER AND OUTPUTS ACTIVAT-
ING (Figure 3)
The half bridges of OUT1, OUT2 and OUT3 can be used with OUT4 to drive three bidirectional motors in full bridge configuration as shown in fig.1 Only one motor can be driven in the same time. The
µ
C writes the corresponding word status 1 till 10 at the bus and latch it with a low pulse in the L9947. So the motor is activated. To stop the motor it is useful to insert a braking phase (status 9). In the braking condition there are all low side DMOS of the half bridges switched-on in this case the flyback currents flows through the low side switches instead of the intrinsic diodes of the half bridges. After that, the half bridges could be switched in tristate (T). The high side driver, OUT5 can be switched only when all the half bridges are in tristate status 10.
The
µ
C works always as master and the L9947
Power Interface as slave. That means: the
µ
C starts the communication between the Power Interface and itself with low transition at the CSN line. CSN = 0, R/WN= 0 the L9947 reads the data at the bus and execute the command as shown in tables 1,3,4 (write mode). The high slope of the
CSN stores the last command and execute it further. All inputs are disabled if CSN= 1.
So the bus can be used for another device. With
CSN = 0 and R/WN = 1 the L9947 writes the status of the diagnostic at the parallel bus until
CSN becomes high (table 2; status
µ
+ 15) (read mode). The power outputs maintain the same status as before.
Figure 3: Signal sequence for data transfer to switch M1 right, read the output status, brake the motor and activate the standby mode.
Obsolete Product(s) - Obsolete Product(s)
8/13
Bus Timing (figure 4)
The bus signal must be defined t 3 = 1
µ s before
CSN goes low. It is allowed to change the level of
R/WN during CSN = 0. The other signals could be changed. To store a command it is mandatory to fix the D0 - D3 and MODE signals t
9
= 1
µ s before the positive edge of CSN.
OVERCURRENT AT OUT1 - OUT5:
The output currents of OUT1 - OUT5 are internally limited. This is realized in the following way:
Figure 4: Bus and Outputs Timing Diagram
L9947
When the output current reaches a certain level
(see pag...) the Gate - Source voltage will be clamped to a lower level. The output current is now limited and follows the output ID, UDS characteristic for this Gate - Source voltage. An internal timer starts when the output voltage drop
(Drain - Source) increases above 0.4V
S
.
After 100
µ s typ. the output is switched OFF and the corresponding overcurrent bit (OVC1 or
OVC2) will be set. The outputs can be activated again with the next input data word.
TIMING CHARACTERISTICS
Symbol Parameter Min.
Typ.
Max.
Unit
Width of CSN Low 20 90* t
1
µ s t
2 t
3
Width of CSN High
Input Signals Before Negative Cdge of CSN
10
1
µ s t
4
µ s t
5
Input Signals After Positive Edge of CSN
Valid Diagnostic Data
1
10
µ s
µ s t
6
Valid Diagnostic Data 10
µ s t
7 t
8 t
9
Delay Time from Input to Power Output, VS = 13V
CSN = Low Duration (Pulse Length) for CLEAR of latched Data
Input Data Before Positive Edge of CSN Which Should be Latched
100
1
300
µ s
µ s
µ s t
1 and t
5
are derived from the internal oscillator frequency t
7
varies with the supply voltage V
S
, relating to the output voltage slope limitation
(*) for t
1
> 100
µ s the latched data will be reseted due to CLEAR (status 20)
9/13
L9947
Diagnostic (TABLE 2; STATUS 11 - 15):
The diagnostic delivers the information of the output voltage status (high or low) at the outputs
OUT1 - OUT5, overcurrent, overvoltage shutdown and over temperature. The output voltage detection is done by hysteresis comparators with thresholds at 0.4VS and 0.6 VS. The overcurrent
(OVC) information is latched till a new or repeated write command was received. The OVC1 is set to high with the overcurrent condition at any of the half-bridge outputs. OVC2 error bit will be set with the overcurrent condition at OUT5. The overvoltage (OVV) is high till the supply voltage V S exceeds the overvoltage threshold of 20V typ.
The overtemperature (OT) is high if the junction temperature is less than typ. 30 Kevin below the thermal shutdown junction temperature (T
JSD
). wake up with a negative edge of CSN.
Thermal Shutdown:
When the junction temperature increases above
T
JSD
the power DMOS transistors are switched off until the junction temperature drops below the value T
JSD
- T
JHYST
.
Clamp Current of The Power Outputs:
For output voltages 10V and larger a clamp current of appr. 50
µ
A will flow in the power outputs due to the internal gate-source voltage limitation, when the device is not in standby.
Overvoltage Shutdown:
Detection of Load Interruption
(TABLE 3):
The outputs OUT1 - OUT4 are connected by the motors in the application. The output OUT4 can be switched as current source or sink with typ.
140mA current capability (status 16 + 17). The sum of current consumption is <1mA if the output current I
OUT4
= 0 (status 17). The diagnostic of the output voltage delivers the information if one or more of the half bridges is shorted to V
S
or
GND or the motor connections are interrupted. In status 18 the outputs OUT1 - OUT3 are switched as current sinks (typ. 10mA), OUt4 and OUt5 as current sources (OUT4 140mA, OUT5 10mA).
With this current the influence of leakage currents and oxidized contacts is eliminated.
When the supply voltage VS exceeds the overvoltage threshold V
SQVT
, typ. 20V,the outputs OUT1
- OUT5 go in tristate condition. If the supply voltage goes under the overvoltage shutdown treshold, the status is the same as before the overvoltage condition occurred.
Undervoltage:
In the voltage range 2V <V CC < 4V the internal logic is reseted and all outputs go in tristate. Also ground spikes on the V
CC
reset the logic. After an internal reset of the logic, the L9947 is controlled again by the inputs.
Ground Interrupt:
Standby (TABLE!; STATUS 2):
The L9947 is set in standby mode with the positive edge of CSN when all other inputs are low.
All latched data will be cleared and the inputs and
The L9947 is protected against interruption. The output OUt5 switches off at ground interruption.
The outputs OUT1 - OUt4 are driven in full bridge configuration as shown in the application. There is no path through the load or direct to another ground. Thus, the device protected.
outputs are in tristate.
The total current consumption is less than 100
µ
A.
CSN=0 quits the standby. All latched data are cleared.
V
CC
Interruption
If the supply voltage V
S
is present and V
CC
is interrupted or not supplied, than two cases can be distinguished:
Clear (TABLE 4: STATUS 20):
Obsolete Product(s) - Obsolete Product(s) the internal latched data will be cleared and the
1 The data pins D0 - D3 are not driven by the
µ
C or they are low. So the outputs OUT1 -
OUT5 and D0 - D3 are in tristate.
outputs become tristate. Repetitive high low Obsolete Product(s) - Obsolete Product(s)
CSN-wire activates this clear function due to the
2 One of the pins D0 - D3 is driven high the
µ
C. This pin supplies the VCC pin by the drain-bulk-diode of the p-channel mos (fig.5).
Depending of the CSN, R/WN and MODE ininternal pull down resistor at CSN input. After a puts some undesiderable functions can occur.
clear, the L9947 goes in standby and can be
10/13
Figure 5: Supply Current Path at V
CC
Interruption
L9947
Obsolete Product(s) - Obsolete Product(s)
11/13
L9947
DIM.
A
B
C
D mm inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
5 0.197
2.65
1.6
0.104
0.063
1 0.039
E
F
0.49
0.66
0.55
0.019
0.75
0.026
0.022
0.030
G 1.02
1.27
1.52
0.040
0.050
0.060
G1 17.53
17.78
18.03
0.690
0.700
0.710
H1 19.6
0.772
L3
L4
L7
H2
L
L1
L2
21.9
21.7
17.65
22.2
22.1
20.2
22.5
22.5
18.1
0.862
0.854
0.695
0.874
0.870
0.795
0.886
0.886
0.713
17.25
17.5
17.75
0.679
0.689
0.699
10.3
10.7
10.9
0.406
0.421
0.429
2.65
2.9
0.104
0.114
M
M1
S
S1
4.25
4.63
1.9
1.9
Dia1 3.65
4.55
5.08
4.85
5.53
2.6
2.6
3.85
0.167
0.182
0.075
0.075
0.144
0.179
0.200
0.191
0.218
0.102
0.102
0.152
OUTLINE AND
MECHANICAL DATA
Multiwatt15 V
Obsolete Product(s) - Obsolete Product(s)
12/13
L9947
Obsolete Product(s) - Obsolete Product(s)
Obsolete Product(s) - Obsolete Product(s)
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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13/13
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