Details and datasheet on part: SA5778

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Part: SA5778

Category:
Automotive

Description: SA5778; Serial Triple Gauge Driver (STGD)

Company: Philips Semiconductors

Datasheet: Download SA5778 datasheet File size : 146 kB

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INTEGRATED CIRCUITS
SA5778 Serial triple gauge driver (STGD)
Product specification Supersedes data of 1997 May 27 IC18 Data Handbook 1998 Apr 03
Philips Semiconductors
Philips Semiconductors
Product specification
Serial triple gauge driver (STGD)
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.
FEATURES
· Major Gauge 10-bit resolution Drive provides 0.35° resolution · Minor gauge drivers provide 0.35° resolution · Serial Data Input
Sine/Cosine outputs for 360° operation 0.2° accuracy typical throughout entire range
112° operation 0.5° accuracy typical throughout entire range Supports interface from microcontrollers Compatible with Philips SGD SA5775A and DGD SA5777A
PIN CONFIGURATION
SIN+ RUN GOE SwCONTROL SwBATT1 GND GND GND GND VBATT SwBATT2 DATAOUT COM C2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SIN COS+ COS ST S CLK GND GND GND GND CS DATAIN C1 C1+ C2+
· 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
SR01116
Figure 1. Pin Configuration
BLOCK DIAGRAM
S CLK DATAIN CS GOE RUN VBATT BIAS, TSD SwBATT, COMMON REFERENCE 9-BIT DATA LATCH ENABLE 7-BIT Tan DAC 7-BIT Tan DAC 7BIT, SINE /COSINE DAC 9-BIT DATA LATCH 10-BIT DATA LATCH 4-BIT STATUS LATCH ST MINOR GAUGE 2 10-BIT SR MINOR GAUGE 1 10-BIT SR MAJOR GAUGE 10-BIT SR DATAOUT
MUX
MUX
MUX
SwBATT1
SwBATT2
COS+
SwControl
COS
COM
GND
SIN+
SIN
C2
C2+
C1
C1+
SR01117
Figure 2. STGD Internal Block Diagram
1998 Apr 03
2
8532055 19199
Philips Semiconductors
Product specification
Serial triple gauge driver (STGD)
SA5778
ORDERING INFORMATION
DESCRIPTION 28-Pin Small Outline (SO) thermally enhanced Package TEMPERATURE RANGE 40 to +105°C ORDER CODE SA5778D DWG # SOT136-1
PIN DESCRIPTION
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Mnemonic GND Pin No. Type I I I I Name and Function 6,7,8,9,20, 21,22,&23 10 3 2 4 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. VBATT GOE RUN SwCONTROL SwBATT1 SwBATT2 O I I Switched Battery Control: Control output to switch on a protected VBATT supply via an external PNP transistor. This output is controlled by the RUN input, GOE input and the on chip protection circuits. 5, 11 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 SCLK and is shifted in MSB first. SCLK 24 18 12 25 I I DATAIN DATAOUT ST O O 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. CS 19 I Chip Select: Active high chip select input. When CS is high, the part is enabled to receive data on the DATAin pin and output data on the DATAout pin. A low to high transition of CS captures device status in 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. SIN+ SIN 1 O O O O O O O O O 28 27 26 16 17 15 14 13 COS+ COS C1+ C1 C2 C2+ 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 2 Positive: Driver output to driven coil of minor gauge 2, positive side. Coil 1 Negative: Driver output to driven coil of minor gauge 1, negative side. Coil 2 Negative: Driver output to driven coil of minor gauge 2, negative side. COM Common: Driver output for junction of bias coils for minor gauges. This output is regulated to half of SwBATT.
ABSOLUTE MAXIMUM RATINGS
SYMBOL VBATT VIN1 VIN2 VIN3 PD TJ
PARAMETER
RATING 40 1 to +7
UNIT V V V V
Battery supply voltage, with recommended 1KW series resistor Input voltage; Data In, CS, SCLK, GOE Input voltage; SwBATT
1 to +24 1 to +40 1400
Input voltage; RUN, with recommended RC Circuit Power Dissipation (Tamb = 105°C) SO-28 Package Ambient operating temperature Junction temperature1 Thermal Impedance
mw °C °C
Tamb JA
40 to +105 +150/+160
See Thermal Management Section
°C/W
NOTE: 1. 160°C junction temperature is permitted during high battery (>16V) fault operation 1998 Apr 03 3

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