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AS8530

Preliminary Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

8 Application Information

8.1 Initialization

When the power supply is switched on, if VSUP > VSUVR_OFF, RESET_VSUP_N becomes inactive (high). After this, the voltage regulator

slow ramp rates on VSUP (of the order of 0.5V/min).

Figure 7. Initialization Sequence for AS8530

Table 13. VSUP>Vsuvr_on and

Block

Output Signal

TRANSCEIVER = Enabled (disabled only during initial VSUP ramp-up)

LIN = high-z, RX = follows V

LDO = Enabled (disabled only during initial ramp-up)

RELAY DRIVER = Enabled

LDRIVE1 = high, LDRIVE2 = high

RESET = Enabled

RESET = high-z

RESISTIVE DIVIDER = Enabled

VBAT= high, VBAT_DIV = enabled

Table 14. VSUP<Vsuvr_on

Block

Output Signal

TRANSCEIVER = Disabled

LIN = high-z, RX = high-z

LDO = Disabled

RELAY DRIVER = Disabled

LDRIVE1 = high, LDRIVE2 = high

LDO Off

LDO On

VCC Por Threshold = 2.75V

LDO setting = 3.3V

Reset Timeout = 4msec

LDO On

VCC Por Threshold = from OTP Block

LDO setting = from OTP Block

Reset Timeout = from OTP Block

VCC

VSUP

Device

Settings

RESET_VCC_N

RESET_VSUP_N

PORN_2_OTP

LOAD_OTP_IN_P

REREG

RESET

VCC_POR_Threshold = 2.75V

VSUP_POR_Threshold = 3.1V

6 Cycles of

RC-Oscillator

PHASE 1

PHASE 2

If Phase 1 POR threshold == Phase 2 POR threshold

Tres = Reset Timeout from OTP Block

If Phase 1 POR threshold != Phase 2 POR threshold

Tres = Reset Timeout from OTP Block