PC8374T datasheet(40/48 Pages) NSC

40 / 48 page

2.0 Device Characteristics (Continued)

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Revision 1.1

2.4.8

Serial Port, Sharp-IR, SIR and Consumer Remote Control Timing

Symbol

Parameter

Conditions

Min1

1. Not tested. Guaranteed by design.

Max1

Unit

tBT

Single Bit Time in Serial Port and Sharp-IR

Transmitter

tBTN − 25

2. tBTN is the nominal bit time in Serial Port, Sharp-IR, SIR and Consumer Remote Control modes. It is deter-

mined by the setting of the Baud Generator Divisor registers.

tBTN + 25

Receiver

tBTN − 2%

tBTN + 2%

tCMW

Modulation Signal Pulse Width in Sharp-IR

and Consumer Remote Control

Transmitter

tCWN − 25

3. tCWN is the nominal pulse width of the modulation signal for Sharp-IR and Consumer Remote Control modes. It

is determined by MCPW field (bits 7-5) of IRTXMC register and TXHSC bit (bit 2) of RCCFG register.

tCWN + 25

Receiver

500

tCMP

Modulation Signal Period in Sharp-IR and

Consumer Remote Control

Transmitter

tCPN − 25

4. tCPN is the nominal period of the modulation signal for Sharp-IR and Consumer Remote Control modes. It is

determined by MCFR field (bits 4-0) of IRTXMC register and the TXHSC bit (bit 2) of RCCFG register.

tCPN + 25

Receiver

tMMIN

5. tMMIN and tMMAX define the time range within which the period of the incoming subcarrier signal has to fall in

order for the signal to be accepted by the receiver. These time values are determined by the contents of the

IRRXDC register and the setting of RXHSC bit (bit 5) of RCCFG register.

tMMAX

tSPW

SIR Signal Pulse Width

Transmitter,

Variable

(3/16) x tBTN − 15

(3/16) x tBTN + 15

Transmitter,

Fixed

1.48

1.78

µs

Receiver

µs

SDRT

SIR Data Rate Tolerance.

% of Nominal Data Rate.

Transmitter

± 0.87%

Receiver

± 2.0%

tSJT

SIR Leading Edge Jitter.

% of Nominal Bit Duration.

Transmitter

± 2.5%

Receiver

± 6.5%

Serial Port

tCMW

tCMP

Sharp-IR

Consumer Remote Control

tBT

SIR

tSPW

PC8374T Datasheet(PDF) 40 Page - National Semiconductor (TI)

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