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SC3610

FREQUENCY AND CLOCK DISPLAY DRIVER

Silan Microelectronics 

Silan

Semiconductors

SC3610

FUNCTIONAL DESCRIPTION

1. RADIO FREQUENCY DISPLAY OPERATION (DTS MODE):

The FM and AM local oscillator output generated from the external RF receiver enters a high gain input

comparator through the FMIN and the AMIN pins respectively. The FM signal then routes through a divide-by-10

dynamic pre-scalar. Depending on the state of the AM/FM-SEL pin, the FM and AM signal will be selected and

enters the IF frequency offset block. Depending on the FM/AM selection, 10.7MHz/70kHz or 455kHz I.F.

frequency will be subtracted or added from the input signal.

LCD Display Range:

Mode

Range

Display range (on LCD)

Step

FM

H

11.00 MHz to 99.99 MHz

10kHz

L

11.00 MHz to 149.9 kHz

100kHz

AM

H

500 kHz to 9999 kHz

1kHz

L

0.5 MHz to 29.99 MHz

10kHz

Note:1 When counter frequency overflow, MSB will not be displayed.

Resolution

1kHz

10kHz

100kHz

1kHz

IF Offset for different application:

IF70K

AMFM-

IF Offset

SEL

0

0

+10.7MHz

0

1

+455kHz

1

0

-70 kHz*

1

1

+455 kHz

* Suitable to use with Silan SC1088

Operation

Display FM input frequency 10.7MHz

Display AM input frequency 455kHz

Display FM input frequency +70kHz

Display AM input frequency 455kHz

2. CLOCK FUNCTION:

1) The clock will be advanced in the following flow:

PM 12:00 → PM 11:59 → AM 12:00 → 11:59

2) The [:] sign is the second indicator and will blink at a rate of 2Hz

3) TIME SETTING:

-- Pressing the keys combination of [TIME SET] [HR SET] or [TIME SET] [MIN SET] will enter the time

setting mode.

-- One digit will be incremented after entering the alarm setting mode. Keep pressing the keys

combination for more than 0.5 seconds will make the digit to be advanced at a rate of 2Hz.

4) ALARM TIME SETTING:

-- Pressing the keys combination of [AL DISP] [HR SET] or [AL DISP] [MIN SET] will enter the alarm time

setting mode. The [AL] indicator will turn on and the [:] sign will stop blinking.

-- One digit will be incremented after entering the alarm setting mode. Keep pressing the keys combination

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0 2000.12.31

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