ST25DV64K datasheet(149/220 Pages) STMICROELECTRONICS

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ST25DV04K ST25DV16K ST25DV64K

RF operations

219

For the ST25DVxx-IE (open drain output), a Set means that the GPO pin is driven to a low

level (VSS) and a Reset releases the GPO (High impedance).

IT corresponds to the GPO pin driven to ground during the IT duration, then pin is released.

Thanks to an external pull up, the high level will be recovered.

Option_flag is not supported. The Inventory_flag must be set to 0.

Request parameters:

•

Request flag

•

UID (optional)

•

Data: Define static or dynamic Interrupt

Response parameter:

•

No parameter. The response is sent back after the write cycle.

Table 156. ManageGPO request format

Request

SOF

Request_ flags ManageGPO IC Mfg code

UID(1)

1. Gray color means that the field is optional.

GPO

VAL(2)

2. See Table 157: GPOVAL

CRC16

Request

EOF

8 bits

A9h

02h

64 bits

8 bits

16 bits

Table 157. GPOVAL

GPOVAL

ST25DVxx-IE (OD)

ST25DVxx-JF (CMOS)

0xxxxxx0b

RF_USER enabled

Pin pull to 0

GPO Pin set to logic One

(VDCG)

0xxxxxx1b

RF_USER enabled

Pin released (HZ)

GPO Pin reset to

logic zero

1xxxxxxxb

RF_INTERRUPT enabled

GPO pin pulled to 0 during IT

Time then released (HZ)

GPO Pin drives a positive

pulse

Any other conditions

GPO realeased (Hz)

GPO pin reset to logic zero

Table 158. ManageGPO response format when Error_flag is NOT set

Response SOF

Response_flags

CRC16

Response EOF

8 bits

16 bits

Table 159. ManageGPO response format when Error_flag is set

Response

SOF

Response_flags

Error code

CRC16

Response

EOF

8 bits

16 bits

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