SA5778 Datasheet, PDF (2/16 Pages) NXP Semiconductors – Serial triple gauge driver STGD

Philips Semiconductors
Serial triple gauge driver (STGD)
Product specification
SA5778
DESCRIPTION
The Serial Triple Gauge Driver (STGD), is a single chip air core
driver providing drive to one major gauge, and two minor gauges, for
automotive applications such as Speedometer, Fuel, Temperature,
Tachometer, Volts, and Oil pressure information display. The STGD
operates in conjunction with a microcontroller receiving serial data
inputs, and can provide status back to the microcontroller either
serially or via a status line. The protocol is compatible with the
Philips Single Gauge Driver (SGD) and Dual Gauge Driver (DGD).
The STGD also includes a protected battery supply for external
single Serial Gauge Drivers or Dual Gauge Drivers.
PIN CONFIGURATION
SIN+ 1
RUN 2
GOE 3
SwCONTROL 4
SwBATT1 5
GND 6
GND 7
GND 8
GND 9
V_BATT 10
SwBATT2 11
DATA_OUT 12
COM ₁₃
C2– ₁₄
28 SIN–
27 COS+
26 COS–
25 ST
24 S_CLK
23 GND
22 GND
21 GND
20 GND
19 CS
18 DATAIN
17 C1–
16 ^C1+
15 ^C2+
SR01116
Figure 1. Pin Configuration
FEATURES
• Major Gauge 10-bit resolution Drive provides 0.35° resolution
– Sine/Cosine outputs for 360° operation
– 0.2° accuracy typical throughout entire range
• Minor gauge drivers provide 0.35° resolution
– 112° operation
– 0.5° accuracy typical throughout entire range
• Serial Data Input
– Supports interface from microcontrollers
– Compatible with Philips SGD SA5775A and DGD SA5777A
• Serial Data Output
– Permits the STGD to be wired in series using a common chip
select to additional STGDs, SGDs, and DGDs
– Permits fault status information to be returned to the
microcontroller
• Over Voltage Protection, Over Temperature Protection and Low
Standby Current Operation
– Gauge drivers disabled when supply voltage exceeds specified
operating voltage, protection to 40V.
– Gauge drivers disabled when die temperature exceeds
operating range
– External switch may supply overvoltage protected battery
supply to other devices operating off battery
• Thermally Enhanced SO-28 surface mount package
BLOCK DIAGRAM
S_CLK
DATA_IN
CS
GOE
RUN
V_BATT
MINOR GAUGE 2
MINOR GAUGE 1
10-BIT SR
10-BIT SR
9-BIT DATA
LATCH
BIAS, TSD
SwBATT,
COMMON
REFERENCE
ENABLE
7-BIT
Tan
DAC
MUX
9-BIT DATA
LATCH
7-BIT
Tan
DAC
MUX
MAJOR GAUGE
10-BIT SR
10-BIT DATA
LATCH
4-BIT STATUS
LATCH
7–BIT, SINE
/COSINE
DAC
MUX
DATA_OUT
ST
1998 Apr 03
Figure 2. STGD Internal Block Diagram
2
SR01117
853–2055 19199