Datasheet

PN532_C1 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2017. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.6 — 28 November 2017
115436 172 of 222
NXP Semiconductors
PN532/C1
Near Field Communication (NFC) controller
8.6.23.33 CIU_GsNOff register (6313h)
Selects the conductance for the N-driver of the antenna driver pins TX1 and TX2 when
there is no RF generated by the PN532.
Table 238. CIU_GsNOff register (address 6313h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol CWGsNOff[3:0] ModGsNOff[3:0]
Reset 10001000
Access R/W R/W R/W R/W R/W R/W R/W R/W
Table 239. Description of CIU_GsNOff bits
Bit Symbol Description
7 to 4 CWGsNOff[3:0] The value of this register defines the conductance of the output
N-driver during the time of no modulation and when there is no RF
generated by the PN532 (neither Tx1RFEn nor Tx2RFEn is set to
logic 1).
Note: The conductance value is binary weighted.
Note: During CIU Power-down mode, if DriverSel[1:0] is not equal to
01b, CWGsNOff[3] is set to logic 1. This is not readable in the
register.
Note: The value of the register is only used if no RF is generated by
the driver, otherwise the value CWGsNOn in the CIU_GsNOn
register is used.
3 to 0 ModGsNOff[3:0] The value of this register defines the conductance of the output
N-driver for the time of modulation and when there is no RF
generated by the PN532 (neither Tx1RFEn nor Tx2RFEn is set to
logic 1).
This may be used to regulate the modulation index when doing load
modulation.
Note: The conductance value is binary weighted.
Note: During CIU Power-down, if DriverSel[1:0] is not equal to 01b,
ModGsNOff[3] is set to logic 1. This is not readable in the register.
Note: The value of the register is only used if no RF is generated by
the driver, otherwise the value ModGsNOn in the CIU_GsNOn
register is used.