SLOS743M August 2011 – March 2020 TRF7970A
PRODUCTION DATA.
Table 6-52 describes the NFC Target Detection Level register.
Function: Defines level for RF wake up, enables automatic SDD and gives NFCID size. This register is supplied by Vin to ensure data retention during complete power down. | ||||||
Default: 0x00 at POR on Vin (not POR based on VDD_X) and not reset at EN = 0 | ||||||
Bit | Name | Function | Description | |||
B7 | Id_s1 | NFCID1 size used in 106-kbps passive target SDD | Id_s1 | Id_s0 | NFCID1 Size
(bytes) |
|
0 | 0 | 4 | ||||
0 | 1 | 7 | ||||
B6 | Id_s0 | 1 | 0 | 10 | ||
1 | 1 | Not allowed | ||||
B5 | Sdd_en | Automatic SDD using internal state machine and ID stored in the NFCID1 Number register (0x17) | ||||
B4 | N/A | |||||
B3 | Hi_rf | Extended range for RF measurements | ||||
B2 | Rfdet_h2 | RF field level required for system wakeup. If all bits are 0, then the RF level detection is off. | Comparator output is displayed in B7 of the NFC Target Protocol register (0x19) | |||
B1 | Rfdet_h1 | |||||
B0 | Rfdet_h0 |