TMS37122 datasheet(39/73 Pages) TI

39 / 73 page

August ’01

Chapter 2. Electrical Description

2.10.3.4 Wake Pattern Detection Flag 'NO_WAKE'

If the NO_WAKE flag is set no Wake Pattern check is performed and the Control Unit

switches directly to Transparent Mode if VWAKE-A threshold is exceeded.

2.10.3.5 Write Distance Expander 2 Flag 'NO_WDE2'

If the NO_WDE2 flag is set the Wake Detector of RF2 input is completely disabled. The RF2

input should be connected to VCL externally in this case. Standby current consumption is re-

duced due to this.

2.10.3.6 Write Distance Expander 3 Flag 'NO_WDE3'

If the NO_WDE3 flag is set the Wake Detector of RF3 input is completely disabled. In this

case the RF3 input should be connected to VCL externally. Standby current consumption is

reduced due to this.

2.10.3.7 CLKA Output Disable Flag ‘NO_CLKA’

If the NO_CLKA flag is set, the CLKA/M output does not provide a clock when WAKE is

activated. This prevents back coupling of interference to the sensitive RF inputs due to not

optimized PCB layout.

The option can be used at identification devices, which do not require the CLKA. This is the

case, if the microcomputer is able to measure period duration or if the data (EOBA) includes

Table 5: Counter Definition for Pulse Position Demodulation

Pulse Position Modulation

PPM Threshold

DEC

Chdet

Thdet Nom.[µs]

MSB

LSB

0001

119

0010

179

0011

238

0100

298

0101

358

0110

417

0111

477

1000

537

1001

596

656

715

104

775

112

120

894

TMS37122 Datasheet(PDF) 39 Page - Texas Instruments

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