AS3682 datasheet(32/43 Pages) AMSCO

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AS3682

austriamicrosystems

Data Sheet

Power-On Reset

www.austriamicrosystems.com

Revision 2.21

32 - 43

11.7 Power-On Reset

The internal reset is controlled by two inputs:

VBAT1 Supply

VDD_GPIO

If either of these voltages is lower than their limit, an internal reset is forced.

The reset levels control the state of all registers. As long as VBAT and VDD_GPIO are below their reset thresholds, the

Access by serial interface is possible once the reset thresholds are exceeded.

Note: VVDD_GPIO_TH – Use rising or falling threshold levels, depending on the slope of VDD_GPIO (power up/power

down).

11.8 Temperature Supervision

An integrated temperature sensor provides over-temperature protection for the AS3682. This sensor generates a flag

if the device temperature reaches the over-temperature threshold (T140 page 8). The threshold has a hysteresis

(T140 page 8) to prevent oscillation effects.

If the device temperature exceeds the T140 threshold, the current sources are switched off, and bit ov_temp in register

Overtemp_control

(page 32) is set to 1.

After decreasing the temperature by THYST, the current sources resume operation.

The ov_temp flag will only be reset (by the circuit when the temperature has reached operating condition again) after

the software has written a 1 and then a 0 to bit rst_ov_temp (page 32).

Bit ov_temp_on activates temperature supervision.

Table 32. Reset Control

Reset Control

VBAT < VPOR_VBAT and VVDD_GPIO < VGPIO_VDD_TH

Undefined

VBAT < VPOR_VBAT and VVDD_GPIO > VGPIO_VDD_TH

Undefined

VBAT > VPOR_VBAT and VVDD_GPIO < VGPIO_VDD_TH

Default

VBAT > VPOR_VBAT and VVDD_GPIO > VGPIO_VDD_TH

Default

Access by serial interface possible.

Table 33. Overtemperature Bit Definitions

Addr: 0E

Overtemp_control

This register reads and resets the overtemperature flag.

Bit

Bit Name

Default

Access

Description

ov_temp_on

1R/W

Activates/deactivates device temperature supervision.

0 = Temperature supervision is disabled. No current source

will be switched off if the device temperature exceeds the

over-temperature rising threshold (T140).

1 = Temperature supervision is enabled.

ov_temp

1 = Indicates that the over-temperature rising threshold

(T140) has been reached. To clear this flag, it is mandatory

to use bit rst_ov_temp. Bit ov_temp is only active if

temperature supervision is activated.

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. Bit rst_ov_temp is only active if

temperature supervision is activated.

7:3

N/A

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