ST25DV16KC-JF8D3 datasheet(45/203 Pages) STMICROELECTRONICS

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Table 33. GPO2

Bit

Name

Function

Factory value

b7-b5

RFU

000b

b4-b2

IT_TIME

Pulse duration = 301 us - IT_TIME x 37.65 us ± 2 us

011b

I2C_RF_OFF_EN

0: disabled 1: A pulse is emitted on GPO when I2C host has

successfully switched the RF off.

I2C_WRITE_EN

0: disabled 1: A pulse is emitted on GPO at completion of

valid I2C write operation in EEPROM

Note:

Refer to Table 13. System configuration memory map for the GPO2 register.

•

Defines interrupt pulse duration on GPO pin for the flowing events: RF_INTERRUPT, FIELD_CHANGE,

RF_PUT_MSG, RF_GET_MSG, RF_WRITE , I2C_RF_OFF_EN and I2C_WRITE_EN.

•

See Eq. (1) for interrupt duration calculation.

Table 34. GPO_CTRL_Dyn access

I2C

Command

Type

Address

Type

Read Dynamic Configuration (cmd code ADh) @00h

Fast Read Dynamic Configuration (cmd code CDh) @00h

E2=0, E1=1,

2000h

b7-b1: RO

b0 : R always, W always

Table 35. GPO_CTRL_Dyn

Bit

Name

Function

Factory value

b7-b1

RFU

0000000b

GPO_EN

0: GPO output is disabled. GPO is High-Z (open drain version) or is tied to ground

(CMOS version).

1: GPO output is enabled. GPO outputs enabled interrupts.

Note:

Refer to Table 14. Dynamic registers memory map for the GPO_CTRL_Dyn register.

•

Allows I2C host to dynamically enable or disable GPO output by writing in GPO_EN bit (b0).

•

GPO_EN bit of GPO_CTRL_Dyn register is prevalent over GPO_EN bit of GPO register.

•

At power up, and each time GPO register is updated, GPO_EN bit content is copied from GPO register.

•

GPO_CTRL_Dyn is a volatile register. Value is maintained only if at least one of the two power sources is

present (RF field or VCC).

•

GPO_CTRL_Dyn bit 0 (GPO_EN) can be written even if I2C security session is closed (I2C password not

presented) but is read only for RF user.

•

Modifying GPO_CTRL_Dyn bit 0 (GPO_EN), does not affect the value of GPO register bit 0 GPO_EN

Table 36. IT_STS_Dyn access

I2C

Command

Type

Address

Type

No access

E2=0, E1=1, 2005h

ST25DV04KC ST25DV16KC ST25DV64KC

GPO

DS13519 - Rev 3

page 45/203

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