MICRF219 datasheet(9/24 Pages) MICREL

9 / 24 page

Micrel

MICRF219

Edge

Detector

DOUT

CLK

Data Edge Pulses

Good

Bit

Select 0, 2, 4, 8 Good

Bits Before Wakeup

January 2009

M9999-011509

(408) 944-0800

D15 = 0 for Normal Operation

D15 = 1 for Auto Polled Operation

SQUELCH

Disables DO

SQUELCH Decode

Window

Counter

Decode

Bad Bits

WAKEUP

Timer (300µs)

WATCHDOG

ontrol

Timer

Serial C

Decode Good

Bit Count

>=7

Good

<=4

Good

Window

Decode

CLK

8 Stage

Shift Register

Auto Poll

CLK

D7 D8

D15

QA1 Bad Bit

Returns to

SLEEP

. Au

low

er when the

circ

od.

regis

t the

trol

re u

g, s

D13, D14 set to the desired sleep time.

The device

will go to sleep for the programmed timer duration

then wake up to receive data if it is present. The

device will stay awake until serial bit D15 is set low,

then set high again, to enable a further sleep period.

The sleep duty cycle may be controlled by the timing

of serial commands.

Auto-Polling with Bit-Checking

For auto-polling with bit-checking, the serial register

bits D7and D8 need to be set for the number of bits to

receiver outputs data

window bits D9, D10,

the data period. The

ves the least critical bit

rimination, the window

towards the normal

en 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

t data again at DO as soon

as the programmed numbers of good RTZ bits have

been received. If a bad bit is seen, the device will

return to sleep mode and poll again for good bits after

the timeout period. Both high and low periods are

checked for each RTZ bit. If data transitions are not

received, the device will return to sleep after the bit-

check watchdog timeout period unless bit D18 has

been sent. In this case the device will continue to

check bits until sufficient good bits enable the device

to wake up, or bad bits return the device to sleep.

Figure 3

Auto-Polling

The auto-poll block (

topoll, Bit-Check Block Diagram

power

rest of

uits to

Auto-

ter, in

sleep

of the

sed to

For simple auto-polling without bit-checkin

end a

serial command with bit D15 set high and bits D12,

be checked as good, before the

at the DO pin. The bit-check

D11 must also be set to match

shortest default window time gi

check action. For better disc

setting may be increased up

minimum time expected betwe

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 outpu

Figure 3) contains a

p tim

oscillator that drives the slee

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, D14 to se

timer period. Bits D7, D8, are used for con

bit-check operation and bits D9, D10, D11 a

adjust the sensitivity of the bit-check action.

Auto-Polling without Bit-Checking

MICRF219 数据表(PDF) 9 Page - Micrel Semiconductor

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MICRF219 数据表(PDF) 9 Page - Micrel Semiconductor

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