Changes from PAN1026 to PAN1026A
The only changes in SDK v4.2.1 are for PAN1026A in order to fix the Bluetooth vulnerability.
When using the Toshiba Bluetooth SDK there is little impact when changing from PAN1026 to PAN1026A, because changes for both Bluetooth Classic and Bluetooth Low Energy are handled internally.
In comparison to PAN1026, PAN1026A supports Bluetooth 4.2. Unfortunately a security vulnerability (https://www.kb.cert.org/vuls/id/304725 ) was discovered for Bluetooth 4.2 devices which also affects PAN1026A.
When using the Toshiba Bluetooth SDK some minor additional handling is necessary in the application to comply with the necessary workaround that is necessary to circumvent the problem. An application note included in the Toshiba Bluetooth SDK explains the details.
When using the low-level TCU command interface the following changes to an application are necessary.
For PAN1026 run-time patches need to be applied, which is not necessary for PAN1026A anymore, so they must be removed. For the Bluetooth Classic portion, no further changes are necessary.
For Bluetooth Low Energy, some workarounds may have been implemented, for example when pairing with iOS devices was necessary. These problems have been fixed and the existing workaround must be removed.
When not using the Toshiba Bluetooth SDK, the necessary steps to fix the Bluetooth 4.2 security vulnerability must to be implemented in the application logic in order to comply with the Bluetooth certification for PAN1026A. An application note included in the Toshiba Bluetooth SDK explains the details.
In general PAN1026A supports new features like extended inquiry response which can be considered to be added in order to improve the performance of the device to be designed.
No impact or change, drop in replacement
The PAN1026 (ENW89837A3KF) and PAN1026A (ENW89837A5KF) are using the TC35661SBG-501 and TC35661SBG-551 respectively, which are both part of the same radio product family from Toshiba Corporation.
From physical perspective, these two parts are identical.
What differentiates these devices is that TC35661SBG-551 supports hardware improvements for LE RX sensitivity and C/I performance.
Since the receiver chain, RX block diagram, and the transmitter chain, TX block diagram, are identical for both devices, we can confirm PAN1026 (ENW89837A3KF) and PAN1026A (ENW89837A5KF) can be considered to be equal from a regulatory perspective.
The RF characteristics of Bluetooth specification are satisfied.
Panasonic updated modular approvals (e.g. FCC/IC) of the PAN1026 via Permissive Change to PAN1026A.