WM8311 datasheet(148/302 Pages) WOLFSON

148 / 302 page

WM8311

Pre-Production

PP, May 2012, Rev 3.1

148

22 SYSTEM STATUS LED DRIVERS

22.1 GENERAL DESCRIPTION

The WM8311 provides two System Status LED Drivers. These are digital outputs intended for driving

LEDs directly. The LED outputs can be assigned to indicate OTP Program status, Power State status

or Battery Charger status. They can also be commanded directly via register control, in order to

provide any other required functionality.

22.2 LED DRIVER CONTROL

LED Drivers are configurable in the ON and SLEEP power states only. The functionality of the LED

Drivers is controlled by the LEDn_SRC register bits, as described in Table 84.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16460

(404Ch)

Status LED1

15:14

LED1_SRC

[1:0]

LED1 Source

(Selects the LED1 function.)

00 = Off

01 = Power State Status

10 = Charger Status

11 = Manual Mode

Note - LED1 also indicates

completion of OTP Auto Program

R16461

(404Dh)

Status LED2

15:14

LED2_SRC

[1:0]

LED2 Source

(Selects the LED2 function.)

00 = Off

01 = Power State Status

10 = Charger Status

11 = Manual Mode

Note - LED2 also indicates an OTP

Auto Program Error condition

Table 84 System Status LED Control

22.2.1 OTP PROGRAM STATUS

The LED drivers indicate the status of the OTP Auto Program function, where the contents of the

external InstantConfig™ (ICE) memory are automatically programmed into the OTP. See

Section 14.6.3 for further details of the OTP Auto Program function.

When the OTP Auto Program function is executed, the System Status LED drivers follow the

functionality defined in Table 85.

LED DRIVER

DESCRIPTION

DRIVE MODE

LED ‘ON’

TIME

ON:OFF

DUTY CYCLE

LED1

OTP Auto Program

Complete

Constant

n/a

LED2

OTP Auto Progam Error

Constant

n/a

Table 85 System Status LED Outputs - OTP Program Status

The OTP Program Status LED outputs will continue until a Device Reset.

Note that the OTP Program Status is always indicated via the LED outputs, regardless of the

LEDn_SRC register fields.

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