SA5777A Datasheet, PDF (4/12 Pages) NXP Semiconductors – Dual air-core gauge driver

Philips Semiconductors
Dual air-core gauge driver
Product specification
SA5777A
Table 2. SA5777A Pin Descriptions for the D Package (Small Outline)
Pin # Name
Function
1.
C1– Negative output connection to the TAN coil of meter #1.
2.
C1+ Positive output connection to the TAN coil of meter #1.
3.
NC
No connect
4.
NC
No connect
5.
NC
No connect
6.
A_GND Ground for V_BB supply. Pins 6, 20 and 23 should be connected on the circuit board.
7.
V_BB Analog supply. Nominally 13.5 V.
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. DATA_OUT output is always active.
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, gauge 1 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.
15.
S_CLK
Serial clock input. Data is loaded into the part on the rising edge of S_CLK. Data is shifted out of DATA_OUT on the falling
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 20-bit word into the DAC registers and updates the output.
17.
NC
No connect
18.
NC
No connect
ST
Status output. This is an open drain output and goes low when the coil output buffers (C1+, C1–, C2+, C2–, COM) have
19.
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.
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.
COM Output drive for biased coils. This output will be 1/2 of V_BB.
25.
NC
No connect
26.
NC
No connect
27.
C2– Negative output connection to the TAN coil of meter #2.
28.
C2+ Positive output connection to the TAN coil of meter #2.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
V_BB
V_CC
V_IN
D_GND to A_GND
Analog supply
Digital supply
Digital input voltage, Data In, OE, CS, S_CLK
Ground difference
T_A
Ambient operating temperature
T_J
Junction temperature
T_STG
P_D
Storage temperature
Power dissipation (T_A = 25°C)¹ N, D packages
θ_JA
DIP and SO packages
NOTE:
1. For power dissipation ratings in still air, derate above 25°C at the following rates:
N and D packages at 12mW/°C
RATING
-1 to +23
-1 to +6
-1 to +6
±0.5
–40 to +85
150
–65 to +150
1500
90
UNIT
V
V
V
V
°C
°C
°C
mW
°C/W
1999 Sep 20
4