AS3675 datasheet(69/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

If the device temperature exceeds the T140 threshold all current sources, the charge pump and the dcdc converter is

disabled and the ov_temp flag is set. After decreasing the temperature by THYST operation is resumed.

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

Bit ov_temp_on = 1 activates temperature supervision Table 91. It is recommend to leave this bit set (default state).

8.11 Serial Interface

The AS3675 is controlled using serial interface pins CLK and DATA:

Figure 34. Serial interface block diagram

Table 90. Overtemperature Detection

Symbol

Parameter

Condition

Min

Typ

Max

Unit

T140

ov_temp Rising

Threshold

140

ºC

THYST

ov_temp Hysteresis

ºC

Table 91. Overtemp control

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

Temperature supervision is disabled. No reset

will be generated if the device temperature

exceeds 140ºC

Temperature supervision is enabled

ov_temp

N/A

Indicates that the overtemperature threshold

has been reached; this flag is not cleared by an

overtemperature reset. It has to be cleared

using rst_ov_temp

rst_ov_temp

0R/W

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

then setting this bit to 0.

AS3675

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