CR95HF Datasheet, PDF (34/63 Pages) STMicroelectronics – 13.56-MHz multi-protocol contactless transceiver IC with SPI and UART serial access

Commands
CR95HF
5.8.4
Managing V_{PS_TX} consumption in Ready state
In Ready state, I_CC RF (V_{PS_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 23. WRREG command description (HF2RF bit)
Direction Data
Comments
Example
0x09 Command code
Host to
CR95HF
0x03 or _{Length of data}
0x04
Analog Register Configuration address
0x68 _index
0x00 or Flag Increment address or not after Write
0x01 command
>>>0x090468010710
I_CC RF (V_{PS_TX}) consumption
is reduced to approx. 2 µA
(typ.) In this case, Reader
mode is not available.
0x07 Index pointing to the HF2RF register
0x00 or
0x10
Set the HF2RF bit to ‘1’ (Reader mode is
not enabled)
or
Reset the HF2RF bit to ‘0’ (Reader mode
is enabled) (default value)
>>>0x090468010700
Reset the HF2RF bit to ‘0’ to
re-enable Reader mode.
CR95HF to
Host
0x00 Result code
0x00 Length of data (= RegCount)
<<<0x0000
Register written
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Doc ID 018669 Rev 8