PN5190
NXP
On NXP Closed-Controllers (PN5190, PN7160, PN7220, etc.), LPCD automatically sets the chip to standby.
Application NoteNxp
PN7642 Frequently Asked Questions (AN13936)
Technical FAQ for NXP PN7642, detailing firmware management, secure key store (SKM) operations, cryptography initialization, I2C addressing, and contact interface compliance.
Overview
This application note provides technical answers to frequently asked questions regarding the NXP PN7642 microcontroller. It covers firmware lifecycle management including downgrade rules, maximum update file sizes, and differences between the PN7642 C100 and C101 variants specifically regarding Pin-less download functionality. The document details the Secure Key Mode (SKM) and the secure key store, explaining authentication counter increments, the permanent locking mechanism after ten failed attempts, and the requirement to provision the APP_ROOT_KEY before others. Further sections address host interface configuration via I2C addressing pins and resolving ATR parsing errors in the contact interface by selecting ISO7816 or EMVCo compliance modes.
Use Cases
- Troubleshooting PN7642 firmware update failures and versioning issues
- Configuring bootloader behavior and Pin-less download timeouts via OTP APIs
- Managing secure keys and understanding SKM authentication limits
- Setting up I2C host interface hardware addressing
- Ensuring contact card interface compliance with ISO7816 or EMVCo standards
Topics
PN7642
PN7642 C100
PN7642 C101
FAQ
Secure Key Store
SKM
Firmware Update
Bootloader
I2C
Cryptography
MbedTLS
ISO7816
Referenced Parts
PN7160
NXP
On NXP Closed-Controllers (PN5190, PN7160, PN7220, etc.), LPCD automatically sets the chip to standby.
PN7220
NXP
On NXP Closed-Controllers (PN5190, PN7160, PN7220, etc.), LPCD automatically sets the chip to standby.
PN7462
NXP
On NXP Open-Controllers (PN7462 and PN7642), LPCD does not automatically set the chip to standby.
PN7642 C100
NXP
The PN7642 is available in two versions: C100 and C101.
PN7642 C101
NXP
The PN7642 is available in two versions: C100 and C101.
| PN5190 | NXP | On NXP Closed-Controllers (PN5190, PN7160, PN7220, etc.), LPCD automatically sets the chip to standby. |
| PN7160 | NXP | On NXP Closed-Controllers (PN5190, PN7160, PN7220, etc.), LPCD automatically sets the chip to standby. |
| PN7220 | NXP | On NXP Closed-Controllers (PN5190, PN7160, PN7220, etc.), LPCD automatically sets the chip to standby. |
| PN7462 | NXP | On NXP Open-Controllers (PN7462 and PN7642), LPCD does not automatically set the chip to standby. |
| PN7642 | NXP | This document is a collection of frequently asked question about PN7642 environment. |
| PN7642 C100 | NXP | The PN7642 is available in two versions: C100 and C101. |
| PN7642 C101 | NXP | The PN7642 is available in two versions: C100 and C101. |