Philips
Semiconductors
SA5775A
Differential air core meter driver
Product specification
Supersedes data of 1997 Feb 24
1999 Sep 20
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
2
1999 Sep 20
853-1929 022369
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
SIN+
SIN-
AGND
VIGN
DATAOUT
DATAIN
VCC
OE
SCLK
CS
ST
nc
DGND
AGND
COS-
COS+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
N Package
SL00453
1
2
3
4
5
6
7
8
9
10
11
12
13
14
24
23
22
21
20
19
18
17
16
15
25
26
27
28
D Package
AGND
DATAOUT
DATAIN
VCC
OE
SCLK
CS
ST
DGND
AGND
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
SIN+
SIN-
VIGN
COS-
COS+
NC
Figure 1. Pin configuration
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
DWG #
16-Pin Plastic Dual In-Line Package (DIP)
-40 to +85
C
SA5775AN
SOT38-4
28-Pin Small Outline Package (SO)
-40 to +85
C
SA5775AD
SOT136-1
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
3
BLOCK DIAGRAM
8
9
10
12
13
14
15
16
1
2
3
4
5
7
6
3
LOGIC
DAC
MUX
SHUTDOWN
LOGIC
11
SL00454
Figure 2. Block diagram
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
GND
Ground for V
IGN
supply. Pins 3, 13 and 14 connected on the circuit board.
4.
V
BB
Analog supply. Nominally 14.0 V.
5.
DATA
OUT
Serial data output. Output of the internal shift register. When a new data word is shifted in, the old word is shifted out the
DATA
OUT
pin.
6.
DATA
IN
Serial data input. A new data word is serially shifted into the part on the rising edge of S
CLK
. The data is shifted in MSB first.
7.
V
CC
5 V logic supply. The internal latches and registers are set to zero on the rising edge of this signal.
8.
OE
Output drivers are turned off when this input is low. Current draw is minimized.
9.
S
CLK
Serial clock input. Data is loaded into the part on the rising edge of S
CLK
.
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-
sition of CS loads the new 10-bit word into the DAC registers and updates the output.
11.
ST
Status output from this IC to indicate that the outputs have been disabled. The outputs may be disabled due to shorted out-
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.
12.
nc
Not connected
13.
D
GND
Ground for V
CC
supply. Connect to Pins 3 and 14.
14.
A
GND
Ground for V
BB
supply. Connect to Pins 3 and 13.
15.
COS
Negative output connection to the COS coil of the gauge.
16.
COS+
Positive output connection to the COS coil of the gauge.
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
4
Table 2.
SA5775A Pin Descriptions for the D Package (Small Outline)
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.
NC
No connect
4.
NC
No connect
5.
NC
No connect
6.
A
GND
Ground for V
IGN
supply. Pins 6, 20 and 23 connected on the circuit board.
7.
V
IGN
Analog supply. Nominally 14.0V.
8.
DATA
OUT
Serial data output. Output of the internal shift register. When a new data word is shifted in, the old word is shifted out the
DATA
OUT
pin.
9.
DATA
IN
Serial data input. A new data word is serially shifted into the part on the rising edge of S
CLK
. The data is shifted in MSB first.
10.
NC
No connect
11.
NC
No connect
12.
NC
No connect
13.
V
CC
5 V logic supply. The internal latches and registers are set to zero on the rising edge of this signal.
14.
OE
Output drivers are turned off when this input is low. Current draw is minimized.
15.
S
CLK
Serial clock input. Data is loaded into the part on the rising edge of S
CLK
.
16.
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
transition of CS loads the new 10-bit word into the DAC registers and updates the output.
17.
NC
No connect
18.
NC
No connect
19.
ST
Status output from this IC to indicate that the outputs have been disabled. The outputs may be disabled due to shorted out-
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.
20.
D
GND
Ground for V
CC
supply. Connect to Pins 6 and 23.
21.
NC
No connect
22.
NC
No connect
23.
A
GND
Ground for V
BB
supply. Connect to Pins 6 and 20.
24.
NC
No connect
25.
NC
No connect
26.
NC
No connect
27.
COS
Negative output connection to the COS coil of the gauge.
28.
COS+
Positive output connection to the COS coil of the gauge.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNIT
V
IGN
Analog supply
-1 to +23
V
V
CC
Digital supply
-1 to +6
V
D
GND
to A
GND
Ground difference
-0.3 to +0.3
V
V
IN
Digital input voltage, Data In, OE, CS, S
CLK
-1 to +7
V
P
D
Power dissipation (T
A
= 25
C)
1
D and N packages
1500
mW
T
A
Ambient operating temperature
40 to +85
C
T
J
Junction temperature
150
C
JA
DIP and SO packages
90
C/W
NOTE:
1. For power dissipation ratings in still air, derate above 25
C at the following rates:
D and N packages at 12mW/
C
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
5
DC ELECTRICAL CHARACTERISTICS
V
IGN
= 7.5 to 18 V; V
CC
= 4.5 to 5.5 V; T
A
= 40 to +85
C.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
IGN
Ignition supply voltage
7.5
18
V
I
IGN
Ignition supply current
V
IGN
= 18 V no load
V
BB
= 18 V with load
R
LC
, R
LS
= R
LMIN
1,2
25
160
mA
I
CC
Logic supply current
V
CC
= 5.5 V
1
mA
V
OH
Output high voltage
Data out I
OH
= 300
A
V
CC
0.8
V
OL
Output low voltage
Data out I
OL
= 1.5 mA
0.4
V
V
OL
Status
I
OL
= 2.8 mA
0.8
V
I
OH
Status
ST, V
CC
= 5 V
25
A
V
IH
Input high voltage
CS, S
CLK
, DATA
IN
0.7 x V
CC
V
V
IL
Input low voltage
CS, S
CLK
, DATA
IN
0.3 x V
CC
V
I
IH
Input high current
CS, S
CLK
, DATA
IN
, V
IN
= 0.7 x V
CC
10
A
I
IL
Input low current
CS, S
CLK
, DATA
IN
, V
IN
= 0.3 x V
CC
10
A
A
CC
Output function accuracy
3
R
LC
, R
LS
= R
LMIN
0.5
0.5
Degree
I
SD
Output shut-down current
COS+, COS, SIN+, SIN
I
SINK
V
IGN
= V
IGN (MAX)
V
IGN
= V
IGN (MIN)
I
SOURCE
V
IGN
= V
IGN (MAX)
V
IGN
= V
IGN (MIN)
97
43
85
43
500
300
500
300
mA
mA
mA
mA
V
DRIVE
Coil drive voltage
V
IGN
= V
IGN (MAX)
V
IGN
= V
IGN (MIN)
68
78
%V
IGN
R
LMIN
Minimum load resistance
T
A
= 85
C
T
A
= 25
C
T
A
= 40
C
215
171
138
NOTE:
1. See Test Circuit.
2. Maximum current is when output is 45 degrees; T
A
= 40
C, and R
L
= 138
.
3. See Table "Output function accuracy"
Table 3.
Output function accuracy
Ideal
Nominal
Input Code
0
0.176
0
45
45.176
128
90
90.176
256
135
135.176
384
180
180.176
512
225
225.176
640
270
270.176
768
360
359.820
1023
N = Binary Input Code
Equation for Output Angle (
) vs Output Voltage
Quadrant
Equation
I
= tan
1
| [(SIN+) (SIN)] / [(COS+) (COS)] |
II
= 180
+tan
1
| [(SIN+) (SIN)] / [(COS+) (COS)] |
III
= 180
+tan
1
| [(SIN+) (SIN)] / [(COS+) (COS)] |
IV
= 360
+tan
1
| [(SIN+) (SIN)] / [(COS+) (COS)] |
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
6
AC ELECTRICAL CHARACTERISTICS
V
DD
= 7.5 to 18 V; V
CC
= 4.5 to 5.5 V; T
A
= 40 to +85
C
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
FS
CLK
Input frequency
1.6
MHz
TS
CLKH
S
CLK
high time
175
ns
TS
CLKL
S
CLK
low time
V
CC
= 5.5 V
175
ns
TRO
Output rise time DO
0.75 to V
CC
1.2 V, C
L
= 90 pF
75
ns
TFO
Output fall time DO
V
CC
1.2 V to 0.75, C
L
= 90 pF
75
ns
TSU
DI set-up time
75
ns
THI
DI hold time
75
ns
TYPICAL APPLICATION
SA5775A
SGD
5
4
12
11
13
14
7
8
COS+
COS
SIN+
SIN
16
15
2
1
DO
5
9
6
VCC
Data Out
14V
10
F
DATAOUT
DATAIN
SCLK
OE
VIGN
NC
ST
DGND
AGND
METER
FROM
MICROPROCESSOR
5V
SL00455
Figure 3. Typical application
SCLK
CS
DI
DO
BIT9
BIT8..1
BIT0
BIT0
PREVIOUS WORD
TSU
THI
SCLK
Tr
Tf
TSCLKL
FSCLKL
TSCLKH
SL00456
Figure 4. Serial interface timing
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
SL00457
Figure 5. SA5775A Test circuit, N package
15
10
5
0
5
10
15
0
127
255
383
511
639
767
895
1023
COS
SIN
DIFFERENTIAL
VOL
T
AGE
INPUT CODE
SL00458
Figure 6. SA5775A output voltages (V
IGN
= 14 V)
0
127
255
383
511
639
767
895
1023
0.8
0.6
0.4
0.2
0.0
0.2
0.4
0.6
0.8
ERROR (DEGREES)
INPUT CODE
VBB = 14V
RL = 200
T = 25
SL00459
Figure 7. Error graph
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
8
DIP16:
plastic dual in-line package; 16 leads (300 mil)
SOT38-4
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
9
SO28:
plastic small outline package; 28 leads; body width 7.5mm
SOT136-1
Philips Semiconductors
Product specification
SA5775A
Differential air-core meter driver
1999 Sep 20
10
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.
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
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.
Data sheet status
[1]
Please consult the most recently issued datasheet before initiating or completing a design.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381
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
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