SA5778D NXP Semiconductors, SA5778D Datasheet - Page 3

• Manufacturer Part Number: SA5778D
• Manufacturer: NXP Semiconductors

Specifications of SA5778D

• Operating Temperature (max): 105C
• Operating Temperature (min): -40C
• Pin Count: 28
• Mounting: Surface Mount
• Package Type: SO
• Screening Level: Industrial
• Lead Free Status / Rohs Status: Compliant

1. 160 C junction temperature is permitted during high battery (>16V) fault operation
Philips Semiconductors
ORDERING INFORMATION
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
NOTE:
1998 Apr 03
28-Pin Small Outline (SO) thermally enhanced Package
SwCONTROL
SYMBOL
Serial triple gauge driver (STGD)
Mnemonic
SwBATT1
SwBATT2
DATA
V
T
V
V
V
DATA
COS+
COS–
BATT
V
P
amb
T
GND
GOE
S
SIN+
SIN–
COM
RUN
IN
IN
IN
C1+
C1–
C2+
C2–
JA
BATT
ST
CS
D
J
CLK
1
2
3
OUT
IN
Battery supply voltage, with recommended 1KW series resistor
Input voltage; Data In, CS, SCLK, GOE
Input voltage; Sw
Input voltage; RUN, with recommended RC Circuit
Power Dissipation (T
Ambient operating temperature
Junction temperature
Thermal Impedance
6,7,8,9,20,
21,22,&23
Pin No.
10
11
24
18
12
25
19
28
27
26
16
17
15
14
13
5,
3
2
4
1
DESCRIPTION
Type
BATT
O
O
O
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
amb
1
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.
Battery supply voltage
Gauge Output Enable: A high on this input enables normal operation of the gauge coil drivers.
See Table 1.
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
transistor. This output is controlled by the RUN input, GOE input and the on chip protection circuits.
Switched Battery Supplies: Used as the reference level for the DACs, bias voltage for the second coils
of the minor gauges, and the supply for the output buffers for the major and minor gauges. One supplies
the major gauge drivers and related circuits, while the other supplies the minor gauge circuits. Both
SwBATT inputs must be connected to the control transistor as the two inputs are not connected internally.
Serial Clock: Used to clock data into and out of the STGD. Data is shifted MSB first.
Data In: Data is loaded on the rising edge of S
Data Out: Is provided to permit the STGD to pass status information back to the controlling
microcontroller, and to allow multiple devices to be connected in series.
Status Output: This is an open drain output. Status outputs from several devices may be wire OR’ed
together. This output is low when the outputs are disabled due to a fault condition. The outputs may be
disabled due to shorted outputs, over temperature, power up reset, or the GOE control pin and this
condition is reflected on the ST pin. The outputs will also be disabled due to an over voltage condition,
however this is not reported on the ST pin as over voltage should be a transient condition.
Chip Select: Active high chip select input. When CS is high, the part is enabled to receive data on the
DATA
the shift register for output. A high to low transition of CS loads gauge data from the shift register into
the data latches.
Sine Positive: Driver output to sine coil of major gauge, positive side.
Sine Negative: Driver output to sine coil of major gauge, negative side.
Cosine Positive: Driver output to cosine coil of major gauge, positive side.
Cosine Negative: Driver output to cosine coil of major gauge, negative side.
Coil 1 Positive: Driver output to driven coil of minor gauge 1, positive side.
Coil 1 Negative: Driver output to driven coil of minor gauge 1, negative side.
Coil 2 Positive: Driver output to driven coil of minor gauge 2, positive side.
Coil 2 Negative: Driver output to driven coil of minor gauge 2, negative side.
Common: Driver output for junction of bias coils for minor gauges. This output is regulated to half of
SwBATT.
= 105 C) SO-28 Package
PARAMETER
in
pin and output data on the DATA
TEMPERATURE RANGE
3
–40 to +105 C
out
Name and Function
pin. A low to high transition of CS captures device status in
CLK
See Thermal Management Section
and is shifted in MSB first.
–40 to +105
+150/+160
–1 to +24
–1 to +40
RATING
–1 to +7
1400
40
ORDER CODE
BATT
SA5778D
supply via an external PNP
Product specification
SA5778
SOT136-1
DWG #
UNIT
mw
C/W
V
V
V
V
C
C