AS3722 datasheet(71/199 Pages) AMSOSRAM

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[v1-01] 2015-Sep-07

AS3722 − Detailed Descriptions- System Functions

Figure 66:

OC_PG Timing Diagram

OC_PG Timing Diagram: Shows the signal timing of the overcurrent-power-good output.

Supervisor

The PMIC has a build in over-temperature protection, which

could be switched off with the serial interface signal

temp_pmc_on (enabled by default; it is not recommended to

disable the over-temperature protection).

Temperature Supervision

The chip has three signals for the serial interface:

ov_temp_alarm0, ov_temp_alarm1 and ov_temp_shutdown.

The flags ov_temp_alarm0/1 are automatically reset if the

over-temperature condition is removed, whereas

ov_temp_shutdown has to be reset by the serial interface with

the signal rst_ov_temp_shutdown.

If the flag ov_temp_shutdown is set, an automatic reset of the

complete chip is initiated. The chip will only start-up when the

temperature falls below the Talarm0 level (including hysteresis).

The flag ov_temp_shutdown is not affected by this reset cycle

allowing the software to detect the reason for this unexpected

shutdown:

A similar supervision is done for the power-stage dies. The

over-temperature alarm flag (temp_sdX_alarm)is set, when a

sub die reaches the alarm level. The over-temperature alarm

flag is set anyway and cleared when the temperature falls below

the threshold. When reaching the shutdown level an automatic

reset (can be masked) of the AS3722 is initiated. The

sd0_on

Vout

Tstart = 250usec max.

OC_PG

10nsec delay

OC_PG>90usec high

(typ. 120usec).

AC_OK or

GPIO3,4,5

if enalbed

100nsec delay done in analog

sd0_vsel

pg_vmask_time=4/8usec

mask

10nsec delay

100nsec

delay done in analog

sd0_lv or ov_curr

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