MFRC522 datasheet(36/109 Pages) NXP

36 / 109 page

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Product data sheet

Rev. 3.2 — 22 May 2007

36 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.3.8

CWGsPReg

Defines the conductance of the P-driver during times of no modulation

9.2.3.9

ModGsPReg

Defines the driver P-output conductance during modulation.

Table 87:

CWGsPReg register (address 28h); reset value: 20h

Bit

Symbol

CWGsP

Access

Rights

RFU

r/w

Table 88:

Description of CWGsPReg bits

Bit

Symbol

Description

7 to 6

Reserved for future use.

5 to 0

CWGsP

The value of this register defines the conductance of the output

P-driver. This may be used to regulate the output power and

subsequently current consumption and operating distance.

Remark: The conductance value is binary weighted.

During soft Power-down mode the highest bit is forced to 1.

Table 89:

ModGsPReg register (address 29h); reset value: 20h

Bit

Symbol

ModGsP

Access

Rights

RFU

r/w

Table 90:

Description of ModGsPReg bits

Bit

Symbol

Description

7 to 6

Reserved for future use.

5 to 0

ModGsP

The value of this register defines the conductance of the output

P-driver for the time of modulation. This may be used to regulate the

modulation index.

Remark: The conductance value is binary weighted.

During soft Power-down mode the highest bit is forced to 1.

If Force100ASK is set to logic 1, the value of ModGsP has

no effect.

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