AS3668 datasheet(22/60 Pages) AMSCO

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AS3668

Data Sheet - D e t a i l e d D e s c r i p t i o n

The ov_temp flag can only be reset by first writing a 1 to the register bit rst_ov_temp. If bit ov_temp_on = 1 activates temperature supervision

Table 20. It is recommend to leave this bit set (default state).

8.6 I²C Serial Interface Bus

The AS3668 supports the I²C serial bus and data transmission protocol in fast mode at 400kHz. The AS3668 operates as a slave on the I²C bus.

Due to the reason that the device is also power up/down with the I²C interface there is a debouncer (130ms) on the signal lines integrated to

avoid a system shut down while having I²C traffic on the bus.

Figure 27. Serial Interface Block Diagram

The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and

STOP conditions. Connections to the bus are made via the open-drain I/O pins SCL and SDA. The clock line SCL is never held low by AS3668

because clock stretching of the bus is not supported.

Figure 28. AS3668 Interface Initialization

Table 20. Overtemperature Detection

Symbol

Parameter

Condition

Min

Typ

Max

Unit

T140

ov_temp Rising Threshold

140

ºC

THYST

ov_temp Hysteresis

ºC

Table 21. Overtemperature Control / VBAT

Monitor Register

0x29 Overtemerature Control / VBAT Monitor Register

Bit

Bit Name

Default

Access

Bit Description

rst_ov_temp

Write a 1 to this register to reset ov_temp

ov_temp

0: Junction temperature is ok and below T140

1: Junction temperature is too high and above T140

ov_temp_on

R/W

0: Disables the overtemperature supervision (not recommended)

1: Enabled the overtemperature supervision

R/W

D15 D14 D13 D12 D11 D10

I2C register address has not been defined yet.

SCLK

SDA

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