AS3688 datasheet(58/72 Pages) AMSOSRAM

58 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

56 - 70

If the device temperature exceeds the 140º threshold all current sources, the charge pump, the ldo and the dcdc

converter is disabled and the ov_temp flag is set. After decreasing the temperature by 5º (typically) operation is

resumed.

The ov_temp flag can only be reset by first writing a 1 and then a 0 to the (bit rst_ov_temp ).

Bit ov_temp_on = 1 activates temperature supervision.

Table

24 – Overtemperature Detection

Symbol

Parameter

Min

Typ

Max

Unit

Note

T140

ov_temp Rising Threshold

140

º C

Thyst

ov_temp Hystersis

º C

7.9.1 Temperature Supervision Registers

Overtemp Control

Addr: 29h

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.

7:3

N/A

7.10 Serial Interface

The AS3688 is controlled using serial interface pins CLK and DATA.

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 AS3688 has the following addresses (factory programmable to 80h,81h or

82h, 83h)

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