STRFNFCA datasheet(38/74 Pages) STMICROELECTRONICS

38 / 74 page

Commands

STRFNFCA

38/74

Doc ID 023077 Rev 10

An efficient 8-step calibration algorithm is described in Example of tag detection calibration

process on page 58.

An example of a basic Idle command used during the Tag Detection Calibration process:

>>>0x07 0E 03 A1 00 F8 01 18 00 20 60 60 00 xx 3F 01

where xx is the DacDataH value.

An example of a tag detection sequence is provided in Example of tag detection command

using results of tag detection calibration on page 61.

5.10

Read Register (RdReg) command (0x08) description

This command is used to read the Wakeup register.

Note:

The Management of the Analog Register Configuration register (ARC_B) is described in

Section 5.11: Write Register (WrReg) command (0x09) description.

5.11

Write Register (WrReg) command (0x09) description

The Write Register (WRREG) command (0x09) is used to:

●

set the Analog Register Configuration address index value before reading or

overwriting the Analog Register Configuration register (ARC_B) value

●

set the Timer Window (TimerW) value used to improve STRFNFCA demodulation

when communicating with ISO/IEC 14443 Type A tags

●

set the AutoDetect Filter used to help synchronization of STRFNFCA with ISO/IEC

18092 tags

●

configure the HF2RF bit(a) to manage ICC RF (VPS_TX) consumption in Ready state

Table 24.

RDREG command description

Direction

Data

Comments

Example

Host to

STRFNFCA

0x08

Command code

Ex 1. >>>0x0803690100

Reads the ARC_B register. (1)

This command must be preceded by the setting of the ARC_B register index (0x0903680001).

0x03

Length of data

0x62

or 0x69

0x01

0x00

ST Reserved

STRFNFCA

to Host

0x00

Result code

<<<0x000113

Depth = 1, Gain = 3 (Ex. 2)

<Len>

Length of data (=

RegCount)

STRFNFCA

to Host

0x82

Error code

<<<0x8200

Invalid command length

0x00

Length of data

When the HF2RF bit is ‘0’, Reader mode is possible (default mode). When set to ‘1’, VPS_TX power

consumption is reduced (Ready mode).

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