STRFNFCA datasheet(42/74 Pages) STMICROELECTRONICS

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Commands

STRFNFCA

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Doc ID 023077 Rev 10

5.11.4

Managing VPS_TX consumption in Ready state

In Ready state, ICC RF (VPS_TX) consumption is generally in the range of 200 µA

(maximum).

This consumption can be reduced to approximately 2 µA (typical) by setting a control bit (bit

HF2RF) to ‘1’ using the Write Register (WRREG) command. In this case, Reader mode is no

longer available.

To re-enable Reader mode, set the HF2RF bit to ‘0’ using the WRREG command or execute

a new PROTOCOLSELECT command.

Table 31.

WRREG command description (HF2RF bit)

Direction

Data

Comments

Example

Host to

STRFNFCA

0x09

Command code

>>>0x090468010710

ICC RF (VPS_TX) consumption

is reduced to approx. 2 µA

(typ.) In this case, Reader

mode is not available.

>>>0x090468010700

Reset the HF2RF bit to ‘0’ to

re-enable Reader mode.

0x03

0x04

Length of data

0x68

Analog Register Configuration address

index

0x00

0x01

Flag Increment address or not after Write

command

0x07

Index pointing to the HF2RF register

0x00

0x10

Set the HF2RF bit to ‘1’ (Reader mode is

not enabled)

Reset the HF2RF bit to ‘0’ (Reader mode

is enabled) (default value)

STRFNFCA

to Host

0x00

Result code

<<<0x0000

0x00

Length of data (= RegCount)

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