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Part: SA5777AN
Category:
Others
Description:
Company: Philips Semiconductors
Datasheet: Download SA5777AN datasheet File size : 146 kB
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INTEGRATED CIRCUITS
SA5777A Dual aircore gauge driver
Product specification Supersedes data of 1997 Feb 24 1999 Sep 20
Philips Semiconductors
Philips Semiconductors
Product specification
Dual air-core gauge driver
SA5777A
DESCRIPTION
The SA5777A is a monolithic driver for controlling air-core (or differential) meters typically used in automotive instrument cluster applications. The circuit interfaces with a microprocessor through a serial bus and directly drives the air-core meter. The SA5777A has 10-bit resolution (0.35 degree) and is guaranteed to be monotonic. Data can be shifted through the part, allowing several SA5777As to be cascaded with only one chip-select line. On-chip current shut down logic protects the circuit from external faults.
PIN CONFIGURATION
N Package
C1 C1+ AGND V BB 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 C2+ C2COM AGND DGND ST CS S CLK
FEATURES
DATAOUT DATAIN V CC OE
· 10-Bit resolution (0.35 degrees) · Exceptional accuracy (0.5 degrees, typical) · High-torque capability · Active differential drivers eliminate back-EMF issues · No RFI/EMI generation issues · Simple serial interface · Simple cascading capability for multiple meters · Internal fault protection · Only one external component required (bypass capacitor)
APPLICATION
D Package
C1 1 C1+ 2 NC 3 NC 4 NC 5 AGND 6 28 27 26 25 24 23 22 21 20 19 18 17 16 15 C2+ C2NC NC COM AGND NC NC DGND ST NC NC CS S CLK
· Instrumentation utilizing air-core meters
V BB 7 DATAOUT DATAIN 8 9
NC 10 NC 11 NC 12 VCC 13 OE 14
SL00460
Figure 1. Pin configuration
ORDERING INFORMATION
DESCRIPTION 16-Pin Plastic Dual In-Line Package (DIP) 28-Pin Plastic Small Outline Package (SO) TEMPERATURE RANGE -40 to +85°C -40 to +85°C ORDER CODE SA5777AN SA5777AD DWG # SOT38-4 SOT136-1
1999 Sep 20
2
853-1930 022368
Philips Semiconductors
Product specification
Dual air-core gauge driver
SA5777A
BLOCK DIAGRAM
VB B OE C2+ 7 + BIT DAC MUX C2 VB B
VBB/2 8 7 + BIT DAC MUX
COM
C1+
8 C1
CS V CC D IN S CLK
9-BIT LATCH
9-BIT LATCH
FAULT DETECTION
ST
10-BIT SHIFT REGISTER
10-BIT SHIFT REGISTER
DOUT
SL00461
Figure 2. Block diagram
Table 1. SA5777A Pin Descriptions for the N Package (Dual In-Line)
Pin # 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. DGND AGND COM C2 C2+ Name C1 C1+ AGND VBB DATAOUT DATAIN VCC OE SCLK CS ST Negative output connection to the TAN coil of meter #1. Positive output connection to the TAN coil of meter #1. Ground for VBB supply. Pins 3, 12 and 13 should be connected on the circuit board. Analog supply. Nominally 13.5 V. Serial data output. Output of the internal shift register. When a new data word is shifted in, the old word is shifted out the DATAOUT pin. DATAOUT output is always active. Serial data input. A new data word is serially shifted into the part on the rising edge of SCLK. The data is shifted in MSB first, gauge 1 first. 5 V logic supply. The internal latches and registers are set to zero on the rising edge of this signal. Output drivers are turned off when this input is low. Serial clock input. Data is loaded into the part on the rising edge of SCLK. Data is shifted out of DATAOUT on the falling edge of SCLK. Active high chip select input. When CS is high, the part is enabled to receive a new serial input word. The high-to-low transition of CS loads the new 20-bit word into the DAC registers and updates the output. Status output. This is an open drain output and goes low when the coil output buffers (C1+, C1, C2+, C2, COM) have been disabled. The coil outputs may be disabled due to shorted outputs, over-temperature conditions, power-on reset, or by the output enable (OE) pin. Multiple status outputs , ST, may be wire OR'ed together. Ground for VCC supply. Connect to Pins 3 and 13. Ground for VBB supply. Connect to Pins 3 and 12. Output drive for biased coils. This output will be 1/2 of VBB. Negative output connection to the TAN coil of meter #2. Positive output connection to the TAN coil of meter #2. Function
1999 Sep 20
3
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