SC2200 datasheet(412/433 Pages) NSC

412 / 433 page

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412

Revision 3.0

Electrical Specifications (Continued)

8.3.10 Serial Port (UART)

Figure 8-41. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Diagram

Table 8-29. UART, Sharp-IR, SIR, and Consumer Remote Control Timing Parameters

Symbol

Parameter

Min

Max

Unit

Comments

tBT

Single Bit Time in UART and

Sharp-IR

tBTN -25

tBTN is the nominal bit time in UART, Sharp-IR, SIR and Consumer Remote Control modes. It is determined by the set-

ting of the Baud Generator Divisor registers.

tBTN + 25

Transmitter

tBTN -2%

tBTN + 2%

Receiver

tCMW

Modulation Signal Pulse

Width in Sharp-IR and

Consumer Remote

Control

tCWN -25

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

termined by the MCPW field (bits [7:5]) of the IRTXMC register and the TXHSC bit (bit 2) of the RCCFG register.

tCWN + 25

Transmitter

500

Receiver

tCMP

Modulation Signal Period in

Sharp-IR and Consumer

Remote Control

tCPN -25

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

by the MCFR field (bits [4:0]) of the IRTXMC registerand the TXHSC bit (bit 2) of the RCCFG register.

tCPN + 25

Transmitter

tMMIN

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 register IRRXDC and

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

tMMAX

Receiver

tSPW

SIR Signal Pulse Width

(3/16)x tBTN -15

(3/16)x tBTN + 15

Transmitter, Variable

1.48

1.78

µs

Transmitter, Fixed

µs

Receiver

SDRT

SIR Data Rate Tolerance

% of Nominal Data Rate

± 0.87%

Transmitter

± 2.0%

Receiver

tSJT

SIR Leading Edge Jitter

% of Nominal Bit Duration

± 2.5%

Transmitter

± 6.5%

Receiver

tBT

tSPW

tCMP

UART

Sharp IR

Consumer

Remote

SIR

tCMW

Control

SC2200 Datasheet(PDF) 412 Page - National Semiconductor (TI)

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