ST25DV64KC datasheet(121/203 Pages) STMICROELECTRONICS

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Figure 64. Write Dynamic Configuration frame exchange between VCD and ST25DVxxKC

SOF

Write Dynamic

Configuration

request

VCD

ST25DVxxKC

EOF

SOF

Write Dynamic

Configuration

response

EOF

SOF

Write Dynamic

Configuration

response

EOF

ST25DVxxKC

Write Dynamic

Configuration sequence

when no error

Write Dynamic

Configuration sequence

when error

7.6.30

Manage GPO

On receiving the Manage GPO command. Depending on the command argument, the ST25DVxxKC force the

GPO output level if RF_USER interrupt is enabled, or send a pulse on GPO output if RF_INTERRUPT is enabled.

If neither RF_USER nor RF_INTERRUPT was enabled, the command is not executed and ST25DVxxKC

responds an Error code “0F”.

The IT duration is defined by IT_TIME bits 4 to 2 of GPO2 static register and occurs just after the command

response.

For the 12- pin package ST25DVxxKC version (CMOS GPO output):

•

Set means that the GPO pin is driven to a High level (VDCG).

•

Reset pulls the GPO pin to a low level (VSS).

•

The IT corresponds to a transmission of a positive pulse on the GPO pin.

For the 12 pin package ST25DVxxKC version (open drain GPO output):

•

Set means that the GPO pin is driven to a low level (VSS).

•

Reset releases the GPO (High impedance). Thanks to an external pull-up, the high level is recovered.

•

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

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

Table 196. Manage GPO request format

Request SOF

Request_ flags

Manage GPO

IC Mfg code

UID (1)

GPO VAL(2)

CRC16

Request EOF

8 bits

A9h

02h

64 bits

8 bits

16 bits

1. This field is optional.

2. See Table 197. GPOVAL

Table 197. GPOVAL

GPOVAL

GPO pin output

0xxxxxx0b

RF_USER enabled

Pin pull to 0

0xxxxxx1b

RF_USER enabled

Pin released (HZ)

1xxxxxxxb

RF_INTERRUPT enabled

GPO pin pulled to 0 during IT Time then released (HZ)

Any other conditions

GPO released (Hz)

ST25DV04KC ST25DV16KC ST25DV64KC

RF commands

DS13519 - Rev 3

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