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MICRF219 Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MICRF219 Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 23 page  Micrel MICRF219 June 2011 10 M9999-060811 (408) 944-0800 low the circ od. regis 14 to set the re used for control re u g, s bits he p for the programmed timer du data if it is present. is se ep peri the al re r of bits to be checked as good, before the receiver outputs data at the DO pin. The bit-check window bits D9, D10, D11 must also be set to match the data period. The shortest default window time gives the least critical bit check action. For better discrimination, the window setting may be increased up towards the normal minimum time expected between data edges. Note an this will result in all e device will remain in n the serial command go to sleep for the e to receive and check a again at DO as soon f good RTZ bits have seen, the device will gain for good bits after the sleep period. Both high and low periods are nable the device e device to sleep. er a programmable rence frequency. If the next pulse edge falls within this window the bit is d and sufficient pulses have or a lack of pulses will ep for a further sleep od. Squelch During normal operation, if four or less out of eight bit pulses are good, the DO output is squelched. If good bit count increases to seven or more in any eight sequential bits, squelch is disabled allowing data to output at DO pin. Auto-Polling The auto-poll block (Figure 3) contains a oscillator that drives the sleep timer when the device is powered down. It also contains check whether the received bits are go polling is controlled by bit D15 in the serial conjunction with bits D12, D13, D power rest of uits to Auto- ter, in sleep of the sed to device will stay awake until serial bit D15 then set high again, to enable a further sle The sleep duty cycle may be controlled by of serial commands. Auto-Polling with Bit-Checking For auto-polling with bit-checking, the seri bits D7and D8 need to be set for the numbe that a window time set longer th bits being tested as bad and th sleep polling mode. Now, whe sets bit D15 high, the device will timer period and will then awak bits. The device will output dat as the programmed numbers o been received. If a bad bit is return to sleep mode and poll a timer period. Bits D7, D8, a bit-check operation and bits D9, D10, D11 a adjust the sensitivity of the bit-check action. Auto-Polling without Bit-Checking For simple auto-polling without bit-checkin serial command with bit D15 set high and D13, D14 set to the desired sleep time. T will go to slee end a D12, device ration The t low, checked for each RTZ bit. The device will continue to check bits until sufficient good bits e to wake up, or bad bits return th Operation Received pulse edges trigg window timer clocked by the refe then wake up to receive od. timing gister flagged as bad. Detected good bits are counte the device will wake up once been received. Two bad pulses cause the device to go to sle timeout peri |
Similar Part No. - MICRF219_11 |
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Similar Description - MICRF219_11 |
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