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 82 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
9.4.11 Switching between F/S mode and HS mode
After reset and initialization, the PN512 is in Fast mode (which is in effect F/S mode as
Fast mode is downward-compatible with Standard mode). The connected PN512
recognizes the “S 00001XXX A” sequence and switches its internal circuitry from the Fast
mode setting to the HS mode setting.
The following actions are taken:
1. Adapt the SDA and SCL input filters according to the spike suppression requirement
in HS mode.
2. Adapt the slope control of the SDA output stages.
It is possible for system configurations that do not have other I
2
C-bus devices involved in
the communication to switch to HS mode permanently. This is implemented by setting
Status2Reg register’s I
2
CForceHS bit to logic 1. In permanent HS mode, the master code
is not required to be sent. This is not defined in the specification and must only be used
when no other devices are connected on the bus. In addition, spikes on the I
2
C-bus lines
must be avoided because of the reduced spike suppression.
9.4.12 PN512 at lower speed modes
PN512 is fully downward-compatible and can be connected to an F/S mode I
2
C-bus
system. The device stays in F/S mode and communicates at F/S mode speeds because a
master code is not transmitted in this configuration.
10. 8-bit parallel interface
The PN512 supports two different types of 8-bit parallel interfaces, Intel and Motorola
compatible modes.
10.1 Overview of supported host controller interfaces
The PN512 supports direct interfacing to various -Controllers. The following table shows
the parallel interface types supported by the PN512.
Table 152. Supported interface types
Supported interface types Bus Separated Address and
Data Bus
Multiplexed Address
and Data Bus
Separated Read and Write
Strobes (INTEL compatible)
control NRD, NWR, NCS NRD, NWR, NCS, ALE
address A0 … A3 [..A5*] AD0 … AD7
data D0 … D7 AD0 … AD7
Multiplexed Read and Write
Strobe (Motorola compatible)
control R/NW, NDS, NCS R/NW, NDS, NCS, AS
address A0 … A3 [..A5*] AD0 … AD7
data D0 … D7 AD0 … AD7