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W55RFS27T3BW Datasheet(PDF) 3 Page - Winbond |
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W55RFS27T3BW Datasheet(HTML) 3 Page - Winbond |
3 / 16 page W55RFS27T3B Publication Release Date:June 8, 2005 - 3 - Revision A1 1.2 W55RFS27T3B Pad Definition 1.2.1 Pad Description SYMBOL PAD NO. I/O FUNCTIONAL DESCRIPTION S3 1 I Manual-mode input, internal pull-high S4 2 I Manual-mode input , internal pull-high CKSEL0 3 I Clock frequency select LSB (please see section 1.2.2 for setup) TEST 4 I TEST=0 for 6-function mode, TEST=1 for 4-function mode CKSEL1 5 I Clock frequency select MSB (please see section 1.2.2 for setup) ANT 6 O RF signal output. An external matching circuit is necessary for connecting with an antenna. GND 7 Ground Ground return path VDD 8 Power Power path RESET 9 I RESET=0 resets whole chip, internal pull-high X1 10 I Input of internal crystal oscillator to connect to an external crystal X2 11 O Output of internal crystal oscillator to connect to an external crystal ID1 12 I ID setting MSB (please see section 1.2.3 for setup) ID0 13 I ID setting LSB (please see section 1.2.3 for setup) TXOUT 14 O TXD Data output S1/~TXD 15 I Manual-mode input or uC-mode: ~TXD, internal pull-high S2/~ENB 16 I Manual-mode input or uC-mode: ~ENB, internal pull-high 1.2.2 Clock Frequency Select (CKSEL) Setup (CKSEL1,CKSEL0) CLOCK FREQUENCY (0,0) 27.145 MHz (0,1) 35.48 MHz (1,0) 40.68 MHz (1,1) 49.86 MHz |
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