S1T8528 データシートの表示（PDF） - Samsung

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S1T8528

ENHANCED-1 CHIP CT0 RF IC

Samsung 

S1T8528

ENHANCED-1 CHIP CT0 RF IC

PIN DESCRIPTION

Pin No Symbol

1

PDT

2

CO

3

SFI

4

SFO

5

LDT/CDO

6

fMCU

7

CLK

8

DATA

9

EN

10

LBD

11

AGIC

12

CRC

13

CPO-

14

CPI

15

GND(COMP)

16

Vcc(COMP)

17

SAO 2

Description

Phase detector output terminal of the transmitter at PLL.

If fTX > fREF or fTX is leading → the output is negative pulse

If fTX < fREF or fTX is lagging → the output is positive pulse

If fTX = fREF and the same phase → the output is High Impedance

Compressor output terminal of compander: connected to the splatter filter amp input

terminal.

Input terminal of Splatter filter amp.

Output terminal of Splatter filter amp.

LDT: Output terminal of transmitter lock detector in PLL block. Output is low if PLL is in

lock state and is high if PLL is in unlock state.

CDO: As an output terminal of the carrier detector buffer, connected to (RSSI ) terminal

of MICOM. This pin outputs the contents of Meter Driver buffer which is turned

on/off, according to the signal level detected by Meter Driver.

Clock output terminal for MCU crystal.

This pin provides the clock source for MCU or other system as an output of

X-tal osc. ÷ 2/ ÷3/ ÷4/ ÷5. Which can be controlled by the bit of the control register.

Clock ON/OFF control is possible by MCU

These pins are serial interface terminals for programming reference counter, auxiliary

reference counter, TX channel counter, RX channel counter and control block that

controls internal each block with 4 mode selection.

Low Battery Detecting output. ( Selectable 3.45V, 3.3V, 3.0V, 2.2V, 2.0V ).

During the normal operation, output level is low, but it is high at low battery detection.

As this pin is an open collector type, it requires a pull-up resister.

This pin bypasses AC elements at the feedback loop which come from the SUM amp

block of COMPRESSOR. A capacitor should be connected between this terminal and

GND. ( C = 2.2uF )

Converts waveform from the full wave rectifier to DC element at the rectifier block of

Compressor. ( RC = 33 msec at C = 3.3uF)

Pre-amp output terminal of Compressor.

Used as an input terminal for voice signals.

Inverting type Pre-amp input terminal of Compressor.

Ground.

Ground of Compander.

Supply voltage.

Power supply terminal of Compander.

Output terminal of speaker amp 2.

This signal is the same as SAO1 output, but phase difference is 180° for SAO1 DC

voltage level is Vcc / 2.

4

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