ST25DV04K datasheet(53/220 Pages) STMICROELECTRONICS

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ST25DV04K ST25DV16K ST25DV64K

ST25DVxxx specific features

219

When VCC is not present, or ST25DVxxx is in low power mode, all events are available on

GPO pin, assuming pull-up resistor is supplied with correct voltage (Open Drain-IE version)

or VDCG is powered (CMOS-JF version). Host can be waken up using GPO interrupt in any

power condition.

Exception is FIELD_CHANGE when RF field is falling, which can’t be reported on GPO

output if VCC is off (no power supply on ST25DVxxx)

5.2.3

GPO registers

Four registers are dedicated to this feature:

•

Two static registers in system configuration

•

Two dynamic registers

Table 16. GPO interrupt capabilities in function of RF field

RF field on

RF field off

GPO state is function of RF events(1)

1. If pull-up resistor is powered (Open Drain-IE version), and VDCG is powered (CMOS –JF

version).

GPO remains High-Z (OD) or tied low (CMOS)

Table 17. GPO interrupt capabilities in function of VCC power supply

GPO events

VCC OFF

VCC ON and

LPD high(1)

(low power mode)

1. For STM25DVxxK-JF only.

VCC ON and

LPD low(1)

FIELD_CHANGE if

RF field disappears

GPO remains High-Z (OD)

or tied low (CMOS)

Pulse emitted on GPO(2)

2. If pull-up resistor is powered (Open Drain-IE version) and VDCG is powered (CMOS-JF

version).

Pulse emitted on GPO

Any other activated

RF event

GPO state is function of

RF events(2)

GPO state is function of

RF events(2)

GPO state is function of

RF events(2)

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