AS3687 datasheet(45/55 Pages) AMSCO

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AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

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7.8.1 Temperature Supervision Registers

Addr: 29h

Overtemp Control

This register reads and resets the overtemperature flag.

Bit

Bit Name

Default

Access

Description

ov_temp_on

Activates/deactivates device temperature supervision.

Default: Off - all other bits are only valid if this bit is set to 1.

0 = Temperature supervision is disabled. No reset will be

generated if the device temperature exceeds 140ºC.

1 = Temperature supervision is enabled.

ov_temp

N/A

1 = Indicates that the overtemperature threshold has been

reached; this flag is not cleared by an overtemperature

reset. It has to be cleared using bit rst_ov_temp.

rst_ov_temp

R/W

The ov_temp flag is cleared by first setting this bit to 1, and

then setting this bit to 0.

7.9

Serial Interface

The AS3687/87XM is controlled using serial interface pins CLK and DATA:

Figure

35 – Serial interface block diagram

Serial

Interface

Logic

1-10k

VDD_I/F

CLK

DATA

The clock line CLK is never held low by the AS3687/87XM (as the AS3687/87XM does not use clock stretching of

the bus).

Table

18 – Serial Interface Timing

Symbol

Parameter

Min

Typ

Max

Unit

Note

VIHI/F

High Level Input voltage

1.38

VBAT

VILI/F

Low Level Input voltage

0.0

0.52

VHYSTI/F

Hysteresis

0.1

tRISE

Rise Time - VILI/F to VIHI/F

1000

tFALL

Fall Time - VIHI/F to VILI/F

300

Pins DATA and CLK

tCLK_FILTER

Spike Filter on CLK

100

tDATA_FILTER

Spike Filter on DATA

300

7.9.1 Serial Interface Features

Fast Mode Capability (Maximum Clock Frequency is 400 kHz)

7-bit Addressing Mode

Write Formats

−

Single-Byte Write

−

Page-Write

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