Philips Semiconductors
Product specification
SA5778
Serial triple gauge driver (STGD)
1998 Apr 03
3
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
–40 to +105
°
C
ORDER CODE
SA5778D
DWG #
SOT136-1
28-Pin Small Outline (SO) thermally enhanced Package
PIN DESCRIPTION
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GND
6,7,8,9,20,
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Battery supply voltage
See Table 1.
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BATT
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of the minor gauges, and the supply for the output buffers for the major and minor gauges. One supplies
SwBATT inputs must be connected to the control transistor as the two inputs are not connected internally.
Circuit Ground Potential.
The pins are used for heat dissipation to board. All pins should be soldered
to foil on the board per the thermal management description.
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SwBATT2
11
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RUN
SwCONTROL
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18
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RUN (Ignition):
Input to sense the state of the Ignition switch. See Table 1.
Switched Battery Control:
Control output to switch on a protected V
BATT
supply via an external PNP
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4
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Status Output:
This is an open drain output. Status outputs from several devices may be wire OR’ed
condition is reflected on the ST pin. The outputs will also be disabled due to an over voltage condition,
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Chip Select:
Active high chip select input. When CS is high, the part is enabled to receive data on the
DATA
in
pin and output data on the DATA
out
pin. A low to high transition of CS captures device status in
the data latches.
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DATA
IN
OUT
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28
15
14
13
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5,
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Data In:
Data is loaded on the rising edge of S
CLK
and is shifted in MSB first.
microcontroller, and to allow multiple devices to be connected in series.
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Switched Battery Supplies:
Used as the reference level for the DACs, bias voltage for the second coils
S
CLK
24
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Serial Clock:
Used to clock data into and out of the STGD. Data is shifted MSB first.
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SIN–
C2+
C2–
COM
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Sine Negative:
Driver output to sine coil of major gauge, negative side.
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O
O
Coil 2 Positive:
Driver output to driven coil of minor gauge 2, positive side.
O
Coil 2 Negative:
Driver output to driven coil of minor gauge 2, negative side.
O
Common:
Driver output for junction of bias coils for minor gauges. This output is regulated to half of
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ST
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25
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SIN+
1
O
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Sine Positive:
Driver output to sine coil of major gauge, positive side.
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1. 160
°
C junction temperature is permitted during high battery (>16V) fault operation
SYMBOL
BATT
IN
P
T
amb
T
J
JA
PARAMETER
RATING
1400
–40 to +105
+150/+160
UNIT
mw
°
C
°
C
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Power Dissipation (T
= 105
°
C) SO-28 Package
Ambient operating temperature
Junction temperature
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