HT9580 datasheet(26/63 Pages) HOLTEK

26 / 63 page

HT9580

April 28, 2000

Preliminary

BAT

D/ A _ P D

V DD

VS S

V DD ( D / A )

DA 7

BAT

R SSI

DA 6

DA 5

DA 4

DA 3

DA 2

DA 1

DA 0

R SSI

DA _ O UT

T he c o nf i g ur at i on of t he 8- bi t D / A c onv e r t er and pow e r dow n c o nt r o l

D/A registers

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

State on

POR

002FH

D/A-L

DA7

DA6

DA5

DA4

DA3

DA2

DA1

DA0

0000 0000

0030H

D/A-H

XXXXX

D/A_PD

RSSI

BAT

uuuu u1uu

The system can quit the HALT mode by an ex-

ternal reset, an interrupt, an external falling

edge signal on port A or an RTC time out.

The HT9580 has one internal 8-bit D/A con-

verter which can measure the battery voltage

and the RSSI input signal from the IF of the RF

circuit. The DA0~DA7 is the digital input of the

D/A converter and the analog outputs to the pin

named DA_OUT. Bit BAT of the DA-H register

(0030H) is the output of the comparator. Its in-

put at the ²-² terminal is from the D/A output

and the ²+² terminal comes from the input pin

BAF. The bit RSSI of DA-H register (0030H) is

the output of another comparator. Its input at

²-² terminal is from the D/A output and ²+² ter-

minal comes from the input pin RSSI. The soft-

ware can detect the battery voltage and the

RSSI signal by writing to the bits DA0 ~DA7

(002FH) and reading the bits BAT, RSSI (0030H).

Bit ²D/A_PD² is used for the D/A power down

control. If this bit is logic high, the D/A will be in

the power down mode. Otherwise, the D/A is in

the normal condition. For details see the follow-

ing figure.

HT9580 Datasheet(PDF) 26 Page - Holtek Semiconductor Inc

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