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 176 of 222
NXP Semiconductors
PN532/C1
Near Field Communication (NFC) controller
8.6.23.37 CIU_GsNOn register (6317h)
Selects the conductance for the N-driver of the antenna driver pins TX1 and TX2 when
generating RF.
Table 246. CIU_GsNOn register (address 6317h) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol CWGsNOn[3:0] ModGsNOn[3:0]
Reset 1 0001000
Access R/W R/W R/W R/W R/W R/W R/W R/W
Table 247. Description of CIU_GsNOn bits
Bit Symbol Description
7 to 4 CWGsNOn[3:0] The value of this register defines the conductance of the output
N-driver. during times of no modulation and when the PN532
generates the RF field.
This may be used to regulate the output power and subsequently
current consumption and operating distance.
Note: The conductance value is binary weighted.
Note: During CIU Power-down mode, if DriverSel[1:0] is not equal to
01b, CWGsNOn[3] is set to logic 1. This is not readable in the register.
Note: The value of the register is only used if RF is generated by the
driver (either Tx1RFEn or Tx2RFEn is set to logic 1), otherwise the
value CWGsNOff in the register CIU_GsNOff is used.
3 to 0 ModGsNOn[3:0] The value of this register defines the conductance of the output
N-driver for the time of modulation and when the PN532 generates the
RF field.
This may be used to regulate the modulation index.
Note: The conductance value is binary weighted.
Note: During CIU Power-down mode, if DriverSel[1:0] is not equal to
01b, ModGsNOn[3] is set to logic 1. This is not readable in the register.
Note: The value of the register is only used if RF is generated by the
driver (either Tx1RFEn or Tx2RFEn is set to logic 1), otherwise the
value ModGsNOff in the register CIU_GsNOff is used.