Data Sheet

Version 2.2
DHAN-T DECT-ULE Module
Supplementary Info
April 16, 2020
DSP Group Confidential
12/17
5. Interfacing the DHAN-T with an external MCU
RSTN Input
At power-up, the Application Host on the external MCU should hold this pin (Pin 3) at logic Low until it is ready
to establish communication (via UART) with the DHAN-T. When ready, the App Host should apply a rising edge
(and leave at Logic High) and wait for the “Hello” indication from the DHAN-T. If at some point later on the MCU
cannot communicate with the DHAN-T, it should apply a low going pulse of >100uS to reset the DHX101 on the
DHAN-T. Note that the RSTN pin is powered by the VBAT power domain. The minimum Logic High level is
0.6*VBAT.
UART, SPI Interfaces
Applications requiring a UART I/F and an SPI interface (eg, SmartVoice ULE applications), will map the former to
GPIOs 10 and 11 (Rx, Tx respectiveky) and the latter to GPIOs 6-9. Where only the UART I/F is required (as in the
Reference Schematic provided above), UART Rx is assigned to GPIO9 and Tx to GPIO10.