MCP2120T-I/P Просмотр технического описания (PDF) - Microchip Technology

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MCP2120T-I/P

Infrared Encoder/Decoder

Microchip Technology 

MCP2120

2.7 Encoding/Decoding Jitter and

Offset

Figure 2-4 shows the jitter and offset that is possible on

the RX pin and the TXIR pin.

Jitter is the possible variation of the desired edge.

Offset is the propagation delay of the input signal (RXIR

or TX) to the output signal (RX or TXIR).

The first bit on the output pin (on RX or TXIR) will show

jitter compared to the input pin (RXIR or TX), but all

remaining bits will be a constant distance.

FIGURE 2-4:

Effects of Jitter and Offset

2.8 Minimizing Power

The device can be placed in a low power mode by

disabling the device (holding the EN pin at the low

state). The internal state machine is monitoring this pin

for a low level, and once this is detected the device is

disabled and enters into a low power state.

2.8.1 RETURNING TO OPERATION

When the device is disabled, the device is in a low

power state. When the EN pin is brought to a high level,

the device will return to the operating mode. The device

requires a delay of 1000 TOSC before data may be

transmitted or received.

BITCLK

RXIR

RX

TX

TXIR

16 CLK

3 CLK

16 CLK

RX Offset

RX Jitter

16 CLK

3 CLK

TX Jitter

16 CLK

TX Offset

DS21618B-page 8

© 2007 Microchip Technology Inc.

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