HT86AR72 datasheet(42/68 Pages) HOLTEK

42 / 68 page

HT86Axx/HT86ARxx

Rev. 1.00

March 19, 2010

Voice ROM Data Address Latch Counter

The Voice ROM address is 21-bits wide and therefore requires three registers to store the address. There are two sets

of three registers to store this address, which are LATCH0H/LATCH0M/LATCH0L and LATCH1H/

LATCH1M/LATCH1L. The 21-bit address stored in one set of these three registers is used to access the 8-bit voice

code data in the Voice ROM. After the 8-bit Voice ROM data is addressed, a few instruction cycles, of at least 4us dura-

tion, are needed to latch the Voice ROM data. After this the microcontroller can read the voice data from the LATCHD

Example: Read an 8-bit voice ROM data which is located at address 000007H by address latch 0

Set

[26H].2

; Enable voice ROM circuit

mov

A, 07H

;

mov

LATCH0L, A

; Set LATCH0L to 07H

mov

A, 00H

;

mov

LATCH0M, A

; Set LATCH0M to 00H

mov

A, 00H

;

mov

LATCH0H, A

; Set LATCH0H to 00H

call

Delay

; Delay a short period of time

mov

A, LATCHD

; Get voice data at 000007H

Power Amplifier

Each device contains an audio power amplifier which is

an integrated class AB monophonic type speaker driver.

It has the properties of high S/N ratio, high slew rate,

low distortion, large output voltage swing, excellent

power supply ripple rejection, low power consumption,

low standby current and power off control etc.

Aud In: Audio input

VBIAS: Speaker non-inverting input voltage reference

SP+:Audio Positive output

SP-: Audio Negative output

OUTP Rising Time (tR)

When AMP_EN enables the Power Amplifer, note that it

requires a certain time before it can output fully on the

OUTP pin. However, this delay time depends on the

value of C1. The C1 capacitor is connected between

VBIAS and VSS.

A M P 1

A M P 2

V B I A S

1 0 R

S P -

A u d I n

B I A S

S P +

A M P _ E N

S P K

C 1

0 . 1 m F

A M P _ E N

O U T P

t R

Capacitor

0.1

mF1mF

4.7

mF10mF

Voltage

2.2V

15ms

30ms

90ms

185ms

15ms

30ms

90ms

185ms

15ms

30ms

90ms

185ms

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