AS3515_08 datasheet(43/67 Pages) AMSCO

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AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6.15 Supervisor

6.15.1 General

This supervisor function can be used for automatic detection of BVDD brown out or junction over-temperature condition.

6.15.2 BVDD Supervision

The supervision level can be set in 8 steps @ 60mV from 2.74 to 3.16V. If the level is reached an interrupt can be generated. If BVDD

reaches 2.6V the AS3515 shuts down automatically.

6.15.3 Junction Temperature Supervision

The temperature supervision level can also be set by 5 bits (120 to –15oC). If the temperature reaches this level, an interrupt can be

generated. The over-temperature shutdown level is always 20oC higher. If the IRQ level is set to 120oC the shutdown is disabled.

6.15.4 Register Description

Interrupts for battery supervision has to be enabled in the IRQ_ENRD0 register (0x25h), while the over-temperature interrupt is controlled

via the IRQ_ENRD1 register (0x26h). All other functions can be set via the following register.

SUPERVISOR Register (24h)

Table 43 Supervisor Register

Bit

Name

Description

7..5

BVDD_Sup<2:0> Supervision of BVDD brown out

V_BrownOut=2.74+x*60mV

000: 2.74V

001: 2.80V

…

110: 3.10V

111: 3.16V

4..0

JT_Sup<4:0>

Junction temperature supervision:

Temp_ShutDown=140-x*5

°C

Temp_IRQ=120-x*5

°C

JT_Sup

IRQ

00000

00001

00010

11110

11111

120oC

115oC

110oC

-30oC

-35oC

ShutDown

OFF

135oC

130oC

-10oC

-15oC

The register is R/W; default value is 00h

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