AS3682-EB2 datasheet(33/43 Pages) AMSCO

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AS3682

austriamicrosystems

Data Sheet

Serial Interface

www.austriamicrosystems.com

Revision 2.21

33 - 43

11.9 Serial Interface

The AS3682 is controlled by serial interface pins DATA/P1 and CLK/P2.

11.9.1 Features

Fast Mode Capability (Maximum Clock Frequency is 400 kHz)

7-Bit Addressing Mode

4 x 8-Bit Read/Write Data Registers (Word Address 0x0 to 0x3)

Write Formats

- Single-Byte Write

- Page-Write

Read Formats

- Current-Address Read

- Random-Read

- Sequential-Read

Asynchronous Reset Input (Active 0)

No Internal System Clock

DATA/P1 Input Delay and CLK/P2 Spike Filtering by Integrated RC Components

11.9.2 Device Address Selection

The serial interface address of the AS3682 can be selected between two fixed settings. The address is selected by

connecting pin ADR to either GND or to V2_5 as shown in Table 34.

11.9.3 Data Transfer Formats

Definitions used in the serial data transfer format diagrams (Figures 19 to 23) are listed in Table 35.

Table 34. AS3682 Device Address Selection

ADR Connected To

Serial Interface Address

GND

40h

V2_5 (Max Voltage = 2.5V)

41h

Table 35. Serial Data Transfer Byte Definitions

Symbol

Definition

Start Condition after Stop

Repeated Start

Device Address

Word Address

Acknowledge

Not Acknowledge

Stop Condition

White Field

Slave as Receiver

Grey Field

Slave as Transmitter

WA++

Increment Word Address Internally

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