CS551 Ver la hoja de datos (PDF) - Cirrus Logic

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CS551

16/20-bit bridge transducer A/D conveter

Cirrus Logic 

CS5516, CS5520

Digital Inputs

RST - Reset, PIN 13.

Reset pin initializes all calibration registers to a known condition and places the serial port into

the command mode.

CS - Chip Select, PIN 14.

An input which can be enabled by an external device to gain control over the serial port. When

this pin is high, SOD is in a high impedance state if SMODE = 0.

SCLK - Serial Data Clock, PIN 16.

A clock signal at this pin determines the output rate of the data from the SOD pin and the input

data rate on the SID pin.

SID - Serial Input Data, PIN 17.

This pin is used for inputting command and configuration words or inputting calibration words.

Data is input at a rate determined by SCLK. SID is in a don’t care state when no data is being

clocked in.

SMODE - Serial Interface Mode, PIN 24.

Selects the operating mode of the serial port. When low the serial port operates in the 5 or 4

wire interface mode. When high the chip will enter the 3 wire interface mode.

Analog Inputs

AIN+ and AIN- - Analog Inputs, PINS 6, 7.

The analog input signals from the transducer. These are true differential inputs.

VREF+ and VREF- - Voltage Reference Inputs, PINS 9,10.

These are the differential analog reference voltage inputs.

MDRV+ - Modulator Differential Voltage Reference, PIN 1.

Positive terminal of the internal differential voltage reference which can be tied to the positive

supply (VA+) or ground (AGND).

MDRV- - Modulator Differential Voltage Reference, PIN 2.

This is the -3.75V modulator differential voltage reference output and can be used to generate

an analog reference. Note this is with reference to the MDRV+ pin.

2288

DS74F21

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