HT9015 datasheet(10/23 Pages) HOLTEK

10 / 23 page

HT9015

April 10, 2000

Preliminary

Functional Description

The HT9015 is a signal chip RF IC for cordless

phone applications. It has applications for

46/49MHz cordless phones as well as CT0 cord-

less phones that have frequency bands between

20MHz and 60MHz. This chip enables external

components in the base set and hand set radio

section application circuits to be reduced.

The HT9015 is manufactured or a special pro-

cess called BiCMOS, or bipolar process and

CMOS process. Because the RF and IF parts

need high frequency actions such as mixer,

VCO, IF amplifier and demodulator, those

parts are implemented in high performance bi-

polar circuits. The other digital functions are

designed using CMOS circuits. Sometimes this

chip is known as ²COMBO², the meaning of

COMBO is one chip combined with RF, IF and

PLL parts.

The HT9015 provides data latch interface con-

trolled by a microcontroller. There are four in-

ternal registers inside the HT9015; TX

(transmitter) divider, RX (receiver) Divider,

REF (reference) divider and Control Register.

All registers can be set through the data latch

control interface. The data latch control inter-

face contains DATA, CLK and STB control sig-

nals.

Input timing for serial data

Data is read on the timing of the rising edge of

CLK. When STB receives a high signal, DATA

in the shift register is sent into the latch to con-

trol the block, see the input timing for serial

data as shown below.

Serial data format of four registers

According to previous input timing Specs, the

HT9015 can be easily set up using four regis-

ters. The TX divider determines the TX PLL

locked frequency; the RX divider determines

the RX PLL locked frequency; the REF divider

determines the TX and RX PLL frequency ref-

erence which is also called channel space. The

control register is an important unit which con-

trols the radio link, voice control and power sav-

ing during base set and hand set

communication.

All data format contains 20 bits, but some regis-

ters need only 16 bits, They have a common

field of 20 bits data format called ²code² which

determine what data belongs to whom. See the

table below.

Code

REF register

TX register

RX register

Control register

Four register selection

P r e v i o u s S ta te

Ne w S t a t e

CL K

DA T A

ST B

O p er at i on S t at e

³ 1 m s

³ 0. 2 m s

³ 0. 1 m s

³ 0. 2 m s

Figure 1 Input timing for serial data

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