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INTEGRATED CIRCUITS
SA5775A Differential air core meter driver
Product specification Supersedes data of 1997 Feb 24 1999 Sep 20
Philips Semiconductors
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
DESCRIPTION
The SA5775A 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 SA5775A has 10-bit resolution (0.35 degree) and is guaranteed to be monotonic. Data can be shifted through the part, allowing several SA5775As 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
SINSIN+ AGND VIGN 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 COS+ COSAGND DGND nc ST CS SCLK
FEATURES
DATAOUT DATAIN VCC OE
* 10-Bit resolution (0.35 degrees) * Exceptional accuracy (0.25 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
SIN- 1 SIN+ 2 NC 3 NC 4 NC 5 AGND 6 VIGN DATAOUT DATAIN 7 8 9 28 27 26 25 24 23 22 21 20 19 18 17 16 15 COS+ COSNC NC NC AGND NC NC DGND ST NC NC CS SCLK
* Instrumentation utilizing air-core meters
NC 10 NC 11 NC 12 VCC 13 OE 14
SL00453
Figure 1. Pin configuration
ORDERING INFORMATION
DESCRIPTION 16-Pin Plastic Dual In-Line Package (DIP) 28-Pin Small Outline Package (SO) TEMPERATURE RANGE -40 to +85C -40 to +85C ORDER CODE SA5775AN SA5775AD DWG # SOT38-4 SOT136-1
1999 Sep 20
2
853-1929 022369
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
BLOCK DIAGRAM
6 5 7 4 3 2 3 8 9 LOGIC 1
10 16
DAC
MUX
15
SHUT-DOWN LOGIC
11
12
13
14
SL00454
Figure 2. Block diagram
Table 1. SA5775A Pin Descriptions for the N Package (Dual In-Line)
Pin # 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Name SIN- SIN+ AGND VBB DATAOUT DATAIN VCC OE SCLK CS ST Negative output connection to the SIN coil of the gauge. Positive output connection to the SIN coil of the gauge. Ground for VIGN supply. Pins 3, 13 and 14 connected on the circuit board. Analog supply. Nominally 14.0 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. 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. 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. Current draw is minimized. Serial clock input. Data is loaded into the part on the rising 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 10-bit word into the DAC registers and updates the output. Status output from this IC to indicate that the outputs have been disabled. The outputs may be disabled due to shorted outputs, over temperature conditions, power up reset, or output enable control pin .This output is an open drain output .Multiple status outputs may be wire OR'ed together .This output is low when the outputs are disabled due to a fault condition. Not connected Ground for VCC supply. Connect to Pins 3 and 14. Ground for VBB supply. Connect to Pins 3 and 13. Negative output connection to the COS coil of the gauge. Positive output connection to the COS coil of the gauge. Function
12. 13. 14. 15. 16.
nc DGND AGND COS- COS+
1999 Sep 20
3
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
Table 2. SA5775A Pin Descriptions for the D Package (Small Outline)
Pin # 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. Name SIN- SIN+ NC NC NC AGND VIGN DATAOUT DATAIN NC NC NC VCC OE SCLK CS NC NC ST DGND NC NC AGND NC NC NC COS- COS+ Positive output connection to the SIN coil of the gauge. No connect No connect No connect Ground for VIGN supply. Pins 6, 20 and 23 connected on the circuit board. Analog supply. Nominally 14.0V. 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. 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. No connect No connect No connect 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. Current draw is minimized. Serial clock input. Data is loaded into the part on the rising 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 10-bit word into the DAC registers and updates the output. No connect No connect Status output from this IC to indicate that the outputs have been disabled. The outputs may be disabled due to shorted outputs, over temperature conditions, power up reset, or output enable control pin. This output is an open drain output. Multiple status outputs may be wire OR'ed together. This output is low when the outputs are disabled due to a fault condition. Ground for VCC supply. Connect to Pins 6 and 23. No connect No connect Ground for VBB supply. Connect to Pins 6 and 20. No connect No connect No connect Negative output connection to the COS coil of the gauge. Positive output connection to the COS coil of the gauge. Function Negative output connection to the SIN coil of the gauge.
ABSOLUTE MAXIMUM RATINGS
SYMBOL VIGN VCC DGND to AGND VIN PD TA TJ JA Analog supply Digital supply Ground difference Digital input voltage, Data In, OE, CS, SCLK Power dissipation (TA = D and N packages 25C)1 1500 -40 to +85 150 90 PARAMETER RATING -1 to +23 -1 to +6 -0.3 to +0.3 -1 to +7 UNIT V V V V mW
Ambient operating temperature Junction temperature DIP and SO packages
C C C/W
NOTE: 1. For power dissipation ratings in still air, derate above 25C at the following rates: D and N packages at 12mW/C
1999 Sep 20
4
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
DC ELECTRICAL CHARACTERISTICS
VIGN = 7.5 to 18 V; VCC = 4.5 to 5.5 V; TA = -40 to +85C. SYMBOL VIGN IIGN ICC VOH VOL VOL Status IOH Status VIH VIL IIH IIL ACC ISD Input high voltage Input low voltage Input high current Input low current Output function accuracy3 Output shut-down current PARAMETER Ignition supply voltage Ignition supply current Logic supply current Output high voltage Output low voltage VIGN = 18 V no load VBB = 18 V with load RLC, RLS = RLMIN1,2 VCC = 5.5 V Data out IOH = 300 A Data out IOL = 1.5 mA IOL = 2.8 mA ST, VCC = 5 V CS, SCLK, DATAIN CS, SCLK, DATAIN CS, SCLK, DATAIN, VIN = 0.7 x VCC CS, SCLK, DATAIN, VIN = 0.3 x VCC RLC, RLS = RLMIN COS+, COS-, SIN+, SIN- ISINK VIGN = VIGN (MAX) VIGN = VIGN (MIN) ISOURCE VIGN = VIGN (MAX) VIGN = VIGN (MIN) VIGN = VIGN (MAX) VIGN = VIGN (MIN) TA = 85C TA = 25C TA = -40C -0.5 97 43 85 43 68 215 171 138 0.7 x VCC 0.3 x VCC 10 10 0.5 500 300 500 300 78 VCC - 0.8 0.4 0.8 25 V V A V V A A Degree mA mA mA mA %VIGN TEST CONDITIONS LIMITS MIN 7.5 TYP MAX 18 25 mA 160 1 mA UNIT V
VDRIVE RLMIN
Coil drive voltage Minimum load resistance
NOTE: 1. See Test Circuit. 2. Maximum current is when output is 45 degrees; TA = -40C, and RL = 138 . 3. See Table "Output function accuracy"
Table 3.
Output function accuracy
Ideal 0 45 90 135 180 225 270 360 Nominal Input Code 0.176 0 45.176 128 90.176 256 135.176 384 180.176 512 225.176 640 270.176 768 359.820 1023 N = Binary Input Code Equation for Output Angle () vs Output Voltage Equation = tan-1 | [(SIN+) - (SIN-)] / [(COS+) - (COS-)] | = 180 +tan-1 | [(SIN+) - (SIN-)] / [(COS+) - (COS-)] | = 180 +tan-1 | [(SIN+) - (SIN-)] / [(COS+) - (COS-)] | = 360 +tan-1 | [(SIN+) - (SIN-)] / [(COS+) - (COS-)] |
Quadrant I II III IV
1999 Sep 20
5
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
AC ELECTRICAL CHARACTERISTICS
VDD = 7.5 to 18 V; VCC = 4.5 to 5.5 V; TA = -40 to +85C SYMBOL FSCLK TSCLKH TSCLKL TRO TFO TSU THI PARAMETER Input frequency SCLK high time SCLK low time Output rise time DO Output fall time DO DI set-up time DI hold time VCC = 5.5 V 0.75 to VCC -1.2 V, CL = 90 pF VCC -1.2 V to 0.75, CL = 90 pF 75 75 175 175 75 75 TEST CONDITIONS LIMITS MIN TYP MAX 1.6 UNIT MHz ns ns ns ns ns ns
TYPICAL APPLICATION
METER
14V
Data Out
1 5 SIN- DATAOUT 9 DATAIN FROM MICROPROCESSOR 6 SCLK
2 SIN+
15
16
SA5775A SGD
OE 8
COS- COS+ 5 DO 4 VIGN NC 12 ST 11 DGND 13
10 F
VCC 7 5V
AGND 14
SL00455
Figure 3. Typical application
FSCLKL TSCLKL SCLK
TSCLKH
Tr
Tf
SCLK
CS
DI TSU DO
BIT9 THI
BIT8..1
BIT0
BIT0 PREVIOUS WORD
SL00456
Figure 4. Serial interface timing
1999 Sep 20
6
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
SL00457
Figure 5. SA5775A Test circuit, N package
15
10
COS
SIN
DIFFERENTIAL VOLTAGE
5
0 0 127 255 383 511 639 767 895 1023
-5
-10
-15
INPUT CODE
SL00458
Figure 6. SA5775A output voltages (VIGN = 14 V)
0.8
0.6 VBB = 14V ERROR (DEGREES) 0.4 RL = 200 T = 25
0.2
0.0
-0.2
-0.4
-0.6
-0.8 0 127 255 383 511 INPUT CODE 639 767 895 1023
SL00459
Figure 7. Error graph 1999 Sep 20 7
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
DIP16: plastic dual in-line package; 16 leads (300 mil)
SOT38-4
1999 Sep 20
8
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
SO28: plastic small outline package; 28 leads; body width 7.5mm
SOT136-1
1999 Sep 20
9
Philips Semiconductors
Product specification
Differential air-core meter driver
SA5775A
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.
Production
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1999 All rights reserved. Printed in U.S.A. Date of release: 09-99 Document order number: 9397 750 06445
Philips Semiconductors
1999 Sep 20 10

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