King Billion Electronics Co., Ltd

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HE83005

HE80000 SERIES

July 28, 2003

10

V3.4

This specification is subject to change without notice. Please contact sales person for the latest version before use.

VOC

VOC[2]

VOC[1]

Output Function

0

0

All Disabled

0

1

VO

1

0

PWM

1

1

PWM+VO

PWMC register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DAC & PWM Data

0

DAC and PWM output value

Control

1

PWM O/P driver

Reserved

PWME

In the PWMC register, the PWMC[7] bit determines the written PWMC[6..0] value is PWM/DAC data or

commands. If the PWMC[1] is ‘0’, the PWMC[6..0] is stored into the data register, otherwise

PWMC[6..0] is stored into command register shown on the above diagram. The command register

controls the PWM output driver current and its enable/disable. If user want to enable the PWM function,

both VOC[2] and PWME bits shall be set to ‘1’.

The fast clock is used to provide as PWM driver time base, and user shall set the PWMC[7]=’1’ and

VOC[2]=’1’ to enable the PWM output. When the system enters into sleep or idle mode, it will

automatically turn off the voice device by clearing VOC[2:0] to ”000”. In order to activate voice output

again when the system returns and enters into normal mode, the related bits of VOC register need to be

set again.

Data=0x40h

Data=0x10h

Data=0x70h

subframe

PWM

When the DAC is used as sound generator, the bias & filter circuit is used for bias voltage setting and

waveform filter regulation and the DAC is output to the VO (Voice Output) pin and please see application

notes for detailed calculation example and application. The driving capability of DAC is shown below.

Condition

Min.

Typ.

Max.

Unit