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L2501

Embedded Modem Family

Conexant Systems 

RC224ATL/224ATLV

EmbeddedModem Family

Table 1-3. Dial Digits/Tone Pairs (2 of 2)

Dial Digit

Tone 1

Frequency (Hz)

6

770

7

852

8

852

9

852

*

941

#

941

A

697

B

770

C

852

D

941

1.0 Functional Description

1.2 Technical Specifications

Tone 2

Frequency (Hz)

1477

1209

1336

1477

1209

1477

1633

1633

1633

1633

1.2.12 Low Power Sleep Mode

To conserve power, the RC224ATLV has two selectable sleep (power-down)

modes – Idle and Stop. If enabled by the IDLEN0 and IDLN1 inputs, the selective

sleep mode is entered whenever the modem is active. The sleep mode indicator

output, SLEEP, is provided to allow external circuits to be powered down when

the modem is in Idle or Stop mode.

The Idle mode allows reduced power consumption with automatic recovery

without additional circuitry. If Idle mode is selected, the modem exits Idle mode

and returns to full operation whenever a ring signal occurs, the DTE writes to the

modem (parallel interface), or WAKEUP input, normally tied to DTR or TXD, is

asserted (serial interface).

The Stop mode further reduces power consumption, as defined in Table 1-4.

Table 1-4. Current and Power Requirements

Mode

Current (ID)

Typical

Current @ 25°C

Maximum Current

@ 0°C

Power (PD)

Typical

Power @ 25°C

Maximum

Power @ 0°C

Operating

Sleep–Idle

Sleep–Stop

21 mA

5 mA

1 mA

22 mA

6 mA

1 mA

100 mW

25 mW

5 mW

110 mW

30 mW

5 mW

NOTE(S):

1. Test conditions: VDD = 5.0 VDC for typical values; VDD = 5.25 VDC for maximum values.

2. Test conditions: VDD = 3.3 VDC for typical values; VDD = 3.6 VDC for maximum values.

D224ATLVDSC

Conexant

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