WM5102 datasheet(272/334 Pages) WOLFSON

272 / 334 page

WM5102

Production Data

PD, June 2014, Rev 4.2

272

JTAG INTERFACE

The JTAG interface provides test and debug access to the WM5102 DSP core. The interface

comprises 5 pins, as detailed below.



TCK: Clock input



TDI: Data input



TDO: Data output



TMS: Mode select input



TRST: Test Access Port reset input (active low)

For normal operation (test and debug access disabled), the JTAG interface should be held in reset (ie.

TRST should be at logic 0). An internal pull-down resistor holds the TRST pin low when not actively

driven.

The other JTAG input pins (TCK, TDI, TMSDSP) should also be held at logic 0 for normal operation.

An internal pull-down resistor holds these pins low when not actively driven.

THERMAL SHUTDOWN

The WM5102 incorporates a temperature sensor which detects when the device temperature is within

normal limits or if the device is approaching a hazardous temperature condition.

The temperature sensor is an input to the Interrupt control circuit and can be used to trigger an

Interrupt event - see “Interrupts”.

The Warning Temperature and Shutdown Temperature status flags can be output directly on a GPIO

pin as an external indication of the temperature sensor. See “General Purpose Input / Output” to

configure a GPIO pin for this function.

It is strongly recommended that the speaker drivers be disabled if the Shutdown Temperature

condition occurs.

WM5102 Datasheet(PDF) 272 Page - Wolfson Microelectronics plc