AS3689 datasheet(58/72 Pages) AMSOSRAM

58 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

56 - 70

7.10 Serial Interface

The AS3689 is controlled using serial interface pins CLK and DATA. The interface follows the two wire serial

interface from the Philips specification.

Figure 31 – Serial Interface Block diagram

Serial

Interface

Logic

1-10k

VDD_GPIO

CLK

DATA

The clock line CLK is never held low by the AS3689 (as the AS3689 does not use clock stretching of the bus).

7.10.1 Serial Interface Features

Fast Mode Capability (Maximum Clock Frequency is 400 kHz)

7-bit Addressing Mode

Write Formats

−

Single-Byte Write

−

Page-Write

Read Formats

−

Current-Address Read

−

Random-Read

−

Sequential-Read

DATA Input Delay and CLK Spike Filtering by Integrated RC Components

7.10.2 Device Address Selection

The serial interface address of the AS3689 has the following address:

80h – Write Commands

81h – Read Commands

Figure 32 – Complete Serial Data Transfer

Start

Condition

Address

R/W

ACK

Data

ACK

Data

ACK

Stop

Condition

DATA

CLK

1-7

7.10.2.1

Serial Data Transfer Formats

Definitions used in the serial data transfer format diagrams are listed in the following table:

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