AS3676 datasheet(77/92 Pages) AMSCO

77 / 92 page

www.austriamicrosystems.com/AS3676

1v1-4

76 - 91

AS3676

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

8.9.1

Reset control register

8.10 Temperature Supervision

An integrated temperature sensor provides over-temperature protection for the AS3676. 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.

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

VPOR_PERI

Reset Level for pins

CLK, DATA

Monitor voltage on pins CLK, DATA

0.29

1.0

1.38

tPOR_DEB

Reset debounce time

for pins CLK, DATA

100

120

tstart

Interface Startup Time

1. Guaranteed by design - min./max. limits not production tested

Table 116. Reset and Overtemp control

Addr: 29h

Reset and Overtemp control

This register reads and resets the overtemperature flag.

Bit

Bit Name

Default Access

Description

shutdwn_enab

0R/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

tPOR_DEB

Table 117. Overtemperature Detection

Symbol

Parameter

Condition

Min

Typ

Max

Unit

T140

ov_temp Rising

Threshold

140

ºC

THYST

ov_temp Hysteresis

ºC

Table 118. Reset and Overtemp control

Addr: 29h

Reset and 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

Table 115. Power On Reset Parameters

Symbol

Parameter

Condition

Min

Typ

Max

Unit

AS3676 Datasheet(PDF) 77 Page - ams AG

AS3676 Datasheet(HTML) 77 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Datasheet Download

Link URL