SA5777AD datasheet(3/12 Pages) PHILIPS

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Philips Semiconductors

Product specification

SA5777A

Dual air-core gauge driver

1999 Sep 20

BLOCK DIAGRAM

9-BIT LATCH

FAULT

DETECTION

7 + – BIT

DAC

10-BIT

SHIFT REGISTER

9-BIT LATCH

10-BIT

SHIFT REGISTER

7 + – BIT

DAC

MUX

COM

C2+

C2–

C1+

C1–

VBB

VCC

DIN

SCLK

DOUT

VBB/2

SL00461

Figure 2. Block diagram

Table 1.

SA5777A Pin Descriptions for the N Package (Dual In-Line)

Pin #

Name

Function

C1–

Negative output connection to the TAN coil of meter #1.

C1+

Positive output connection to the TAN coil of meter #1.

AGND

Ground for VBB supply. Pins 3, 12 and 13 should be connected on the circuit board.

VBB

Analog supply. Nominally 13.5 V.

DATAOUT

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.

DATAIN

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.

VCC

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.

SCLK

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.

10.

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.

11.

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.

12.

DGND

Ground for VCC supply. Connect to Pins 3 and 13.

13.

AGND

Ground for VBB supply. Connect to Pins 3 and 12.

14.

COM

Output drive for biased coils. This output will be 1/2 of VBB.

15.

C2–

Negative output connection to the TAN coil of meter #2.

16.

C2+

Positive output connection to the TAN coil of meter #2.

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