Datasheet

PN512 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 5.2 — 16 June 2016
111352 75 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
The MSB of the first byte sets the mode used. To read data from the PN512, the MSB is
set to logic 1. To write data to the PN512 the MSB is set to logic 0. Bit 6 is reserved for
future use, and bits 5 to 0 define the address; see Table 151
.
9.4 I
2
C Bus Interface
An I
2
C-bus (Inter-IC) interface is supported to enable a low-cost, low pin count serial bus
interface to the host. The I
2
C-bus interface is implemented according to
NXP Semiconductors’ I
2
C-bus interface specification, rev. 2.1, January 2000. The
interface can only act in Slave mode. Therefore the PN512 does not implement clock
generation or access arbitration.
The PN512 can act either as a slave receiver or slave transmitter in Standard mode, Fast
mode and High-speed mode.
SDA is a bidirectional line connected to a positive supply voltage using a current source or
a pull-up resistor. Both SDA and SCL lines are set HIGH when data is not transmitted. The
PN512 has a 3-state output stage to perform the wired-AND function. Data on the I
2
C-bus
can be transferred at data rates of up to 100 kBd in Standard mode, up to 400 kBd in Fast
mode or up to 3.4 Mbit/s in High-speed mode.
If the I
2
C-bus interface is selected, spike suppression is activated on lines SCL and SDA
as defined in the I
2
C-bus interface specification.
See Table 171 on page 117
for timing requirements.
Table 151. Address byte 0 register; address MOSI
7 (MSB) 6 5 4 3 2 1 0 (LSB)
1 = read
0 = write
reserved address
Fig 17. I
2
C-bus interface
001aan222
PN512
SDA
SCL
I2C
EA
ADR_[5:0]
PULL-UP
NETWORK
CONFIGURATION
WIRING
PULL-UP
NETWORK
MICROCONTROLLER