Philips sa5775a DATASHEETS
INTEGRATED CIRCUITS
SA5775A
Differential air core meter driver
Product specification
Supersedes data of 1999 Sep 20
2000 Aug 10
Philips Semiconductors Product specification
SA5775ADifferential air-core meter driver
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.
FEATURES
•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
•Instrumentation utilizing air-core meters
PIN CONFIGURATION
1
SIN-
SIN+
2
A
3
GND
4
V
IGN
DATA
DATA
DATA
5
OUT
6
IN
V
7
CC
89
OE
SIN-
1
2
SIN+
3
NC
NC
4
5
NC
6
A
GND
7
V
IGN
8
OUT
9
DATA
IN
10
NC
NC NC
11
12
NC NC
13
V
CC
OE
14
Figure 1. Pin configuration
N Package
D Package
16
COS+
15
COS-
A
14
GND
13
D
GND
12
nc
11
ST
10
CS
S
CLK
COS+
28
27
COS-
NC
26
25
NC
24
NC
23
A
GND
NC
22
NC
21
20
D
GND
19
ST
18
17
16
CS
15
S
CLK
SL00453
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
16-Pin Plastic Dual In-Line Package (DIP)
28-Pin Small Outline Package (SO)
2000 Aug 10 853-1929 024325
2
-40 to +85°C
-40 to +85°C
SA5775AN SOT38-4
SA5775AD SOT136-1
Philips Semiconductors Product specification
SA5775ADifferential air-core meter driver
BLOCK DIAGRAM
4576 3
2
8
9
10
LOGIC
3
1
16
DAC MUX
11
12 13 14
SHUT–DOWN
LOGIC
15
SL01252
Figure 2. Block diagram, pin numbers for DIL package
Table 1. SA5775A Pin Descriptions for the N Package (Dual In-Line)
Pin # Name Function
1. SIN– Negative output connection to the SIN coil of the gauge.
2. SIN+ Positive output connection to the SIN coil of the gauge.
3. A
4. V
5. DATA
6. DATAINSerial data input. A new data word is serially shifted into the part on the rising edge of S
7. V
8. OE Output drivers are turned off when this input is low. Current draw is minimized.
9. S
10. CS Active high chip select input. When CS is high, the part is enabled to receive a new serial input word. The high-to-low tran-
11. ST Status output from this IC to indicate that the outputs have been disabled. The outputs may be disabled due to shorted out-
12. nc Not connected
13. D
14. A
15. COS– Negative output connection to the COS coil of the gauge.
16. COS+ Positive output connection to the COS coil of the gauge.
Ground for V
GND
Analog supply. Nominally 14.0 V.
IGN
Serial data output. Output of the internal shift register. When a new data word is shifted in, the old word is shifted out the
OUT
DATA
OUT
5 V logic supply. The internal latches and registers are set to zero on the rising edge of this signal.
CC
Serial clock input. Data is loaded into the part on the rising edge of S
CLK
supply. Pins 3, 13 and 14 connected on the circuit board.
IGN
pin.
CLK
. The data is shifted in MSB first.
CLK
.
sition of CS loads the new 10-bit word into the DAC registers and updates the output.
puts, 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 3 and 14.
GND
Ground for VBB supply. Connect to Pins 3 and 13.
GND
2000 Aug 10
3
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