SiLabs Si2400 - Connect One
SiLabs Si2400 - Connect One
SiLabs Si2400 - Connect One
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Reference Design<br />
Pin Descriptions:<br />
Pin Name<br />
-DTRM<br />
-CDM<br />
RESET<br />
TXDM<br />
-CTSM<br />
RXDM<br />
RXDH232<br />
TXDH232<br />
Pin Description<br />
Data Terminal Ready Modem (Output, TTL Active Low):<br />
This pin is used to drop the modem carrier.<br />
Carrier Detect Modem (Input, TTL Active Low):<br />
This pin gets the carrier detect signal from the modem.<br />
Modem and iChip Reset:<br />
An active low RESET input resets both the iChip and the modem.<br />
Transmit Data Modem (Output TTL):<br />
This pin supplies asynchronous serial transmit data from the iChip<br />
to the modem.<br />
Clear To Send Modem (Input, TTL Active Low):<br />
This pin provides the clear to send signal for the asynchronous<br />
serial port when the flow control option is enabled. When -CTSM<br />
is asserted, the transmitter begins transmission of a data frame, if<br />
any is available. If –CTSM is de-asserted, the transmitter holds the<br />
data in the serial port transmit register. The value of –CTMS<br />
is checked only at the beginning of the transmission of a frame.<br />
Receive Data Modem (Input, TTL):<br />
This pin supplies asynchronous serial receive data from the modem<br />
to the iChip.<br />
Receive Data Host (Input, RS232):<br />
This pin supplies asynchronous serial receive data from the Host<br />
processor to iChip.<br />
Transmit Data Host (Output, RS232):<br />
This pin supplies asynchronous serial transmit data from the iChip<br />
to the Host processor.<br />
Table 3<br />
DB9 - J1<br />
SL-IERB<br />
iChip<br />
JP3 ON <strong>Si2400</strong><br />
<strong>Si2400</strong>URT-<br />
EVB Rev. 3<br />
RJ11<br />
JP7<br />
HOLE<br />
Figure 1. Mechanical Diagram.<br />
Page 3<br />
July 2001
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