CH2100 データシートの表示（PDF） - Cermetek Microelectronics

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CH2100

Super Small 2400bps Modem Module

Cermetek Microelectronics 

Table 2. CH2100 Pin Descriptions

PIN NAME TYPE

F U N C T ION

1

TIP

I/O

D i re ctly co nne cts to the te le p ho ne li ne 's Ti p le a d thro ug h a use r sup p li e d RJ-11C ja ck. Ti p a nd

Ring are not polarity sensitive and may be reversed.

2

RING

I/O

D i re ctly co nne cts to the te le p ho ne li ne 's Ri ng le a d thro ug h a use r sup p li e d RJ-11C ja ck. Ti p a nd

Ring are not polarity sensitive and may be reversed.

3

__

RI

O

R IN G IN D IC AT ION . A LOW for 2 seconds indicates that the local telephone line is ringing. this

signal follows the frequency of the ringing signal (normally about 20 or 30 Hz for 2 seconds).

4

GND

-

GR OU N D . Note: Noise should be less than 50mV peak to peak.

5

RXD

O

R E C E IV E D ATA. Serial Receive data output. Received marking or binary 1 condition is

i nd i ca te d b y HIGH. RX D fo r co mmuni ca ti o n to ho st co ntro lle r fro m C H2100.

6

TXD

I

T R AN S MIT D ATA. Serial transmit data input. Marking, or a binary 1 condition, is transmitted

whe n a HIGH i s a sse rte d . TX D fo r co mmuni ca ti o n fro m ho st co ntro lle r to C H2100.

_____

R E S E T i np ut. A cti ve LOW. Thi s i np ut must b e a sse rte d LOW fo r a t le a st 10 ms to re se t the

7

RS T1

I

mo d e m. RE S E T i s the n re turne d HIGH fo r no rma l o p e ra ti o n. If no syste m re se t i s a va i la b le ,

attach a 330K ohm resistor to 5V and a 0.1uf capacitor to ground to create a reset.

8

VCC

-

P OW E R S U P P LY. 5 Vo lts + 5% No te : No i se sho uld b e le ss tha n 50mV p e a k to p e a k.

Note: (1) If VCC has a slow power up ramp time, the internal reset may be ineffective.

Figure 2. CH2100 Application Diagram.

1999 Cermetek Microelectronics, Inc.

Document No. 607-2100 Rev.C (8/99) 3

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