MICRF219A datasheet(16/23 Pages) MICREL

16 / 23 page

Micrel, Inc.

MICRF219A

July 2011

M9999-071811-A

RadioTech@micrel.com

Auto-Poll Programming Example

RF frequency 433.92MHz, bit rate 1kbps, bit width 1ms.

D[19] = 0, AGC fast attack enabled

D[18] = 1, watchdog timer is OFF

D[17] = 0, SQ pin floating, squelch is OFF

D[16] = 0

D[15] = 1, device is placed in autopoll

D[14:12] = 100, sleep time 160ms

D[11:9] = 011, bit check window time 457μs with D[4:3]

= 00

D[8:7] = 10, number of consecutive valid bits is 8

D[6:5] = 11, slice level 50%

D[4:3] = 00, demodulator bandwidth = 1.625kHz

D[2:0] = 000, no desense

Figure 12. Auto-Poll Example

From MSB to LSB, see Table 5:

As noted in the Absolute Maximum Ratings section, the

voltage on SCLK can go up to VDD + 0.3V without

causing damage. But applying VDD + 0.3V to SCLK can

put the part in an unknown test mode. If this accidently

happens, cycle the power supply to restore the part to

normal operation

D19

D18

D17

D16

D15

D14

D13

D12

D11 D10 D9

Table 5. Auto-Poll example bit sequence.

or (408) 944-0800

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