Application Circuits

Application circuit 1

HT9032

8

April 6, 2000

Operation mode

There are three operation modes of the HT9032. They are power down mode, partial power up mode,

and power up mode. The three modes are classified by the following conditions:

Modes

Conditions

Current

Consumption

Power down

PDWN=²1² and RTIME=²1²

<1mA

Partial power up PDWN=²1² and RTIME=²0²

1.9mA typically

Power up

PDWN=²0²

3.2mA typically

Normally, the PDWN pin and the RTIME pin

control the operation mode of the HT9032.

When both pins are HIGH, the HT9032 is set at

the power down mode, consuming less than 1mA

of supply current. When a valid power ring ar-

and the portions of the part involved in the ring

signal analysis are enabled. This is partial

power up mode, consuming approximately

1.9mA typically. Once the PDWN pin is below

to receive FSK. During this mode, the device

current will increase to approximately 3.2mA

(typ). The state of the RTIME pin is now a

²don¢t care² as far as the part is concerned. Af-

ter the FSK message has been received, the

the part will return to the power down mode.

H T 10 50

~

~

TI P

VD D

X2

PD W N

VS S

RI NG

X1

DO UT

H T 9032B / D

3. 58 M H z

10M W

30pF

30pF

15k W

18k W

20 0k W

0. 01 m F

47 0k W

0. 01 m F2 0 0 k W

0. 2 m F

TI P

RI NG

0. 2 m F

0. 1 m F

9V

m C