AS3677 datasheet(55/68 Pages) AMSCO

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AS3677

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

Figure 29. Zero Power Device Wakeup block diagram

8.8.1

Reset control register

8.9

Temperature Supervision

An integrated temperature sensor provides over-temperature protection for the AS3677. This sensor generates a flag

if the device temperature reaches the overtemperature threshold of 140º. The threshold has a hysteresis to prevent

oscillation effects.

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.

Table 92. Power On Reset Parameters

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VPOR_VBAT

Overall Power-On

Reset

Monitor voltage on VBAT; power-on reset for

all internal functions.

2.0

VPOR_PERI

Reset Level for pins

CLK, DATA

Monitor voltage on pins CLK, DATA

1.0

tPOR_DEB

Reset debounce time

for pins CLK, DATA

100

tstart

Interface Startup Time

Table 93. Overtemp control

Addr: 29h

Overtemp control

This register reads and resets the overtemperature flag.

Bit

Bit Name

Default Access

Description

shutdwn_enab

1R/W

Enable Shutdown mode and serial interface reset.

Serial Interface reset disabled. Device does not

enter Shutdown mode

Serial Interface reset enabled, device enters

shutdown when SCL and SDA remain low for

min. 100ms

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AS3677

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