MICRF219 datasheet(18/23 Pages) MICREL

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Micrel

MICRF219

June 2011

M9999-060811

(408) 944-0800

the

are

(LSB D0)

1, and D2

e only bits

t sequence

if only the

ence must

s the stop

ides D17)

ended that

Q) be kept

After the

uence (as

mode and

reestablish the DO pin as an output again. To do so,

the

in ch nges

from

high, then low again, followed by the

SCL

of the programming bits

are

e kept as shown belo :

T1 < 0.1µs, Time from SCLK to convert DO to

input pin

T6 > 0.1µs, SCLK high time

T7 > 0.1µs, SCLK low time

T2, T3, T4, T5, T8, T9, T10 > 0.1µs

Bits are serially programmed starting with

significant bit (MSB = D19) if all bits

programmed until the least significant bit

For instance, if only the desense bits D0, D

are being programmed, then these are th

that need to be programmed with the star

D2, D1, D0, plus the stop sequence. Or,

squelch bit D17 is needed, then the sequ

be from start sequence, D17 through D0 plu

sequence, making sure the other bits (bes

are programmed as needed. It is recomm

all parallel input pins (SEL0, SEL1, and S

high when using the serial interface.

programming bits are finished, a stop seq

shown in Figure 14) is required to end the

most

being

SCLK pin is kept high while the DO p

low to

K pin made low. Timing

not critical, but should b

DO PIN AS OUTPUT

“1”

“0”

“1”

SCLK

T10

BIT TIME 18

BIT TIME 19

Figure 14. Serial Interface Stop Sequence

SCLK frequency should be greater than 5kHz to avoid

automatic reset from internal circuitry.

ing Examples

See Figures 15 – 17. (Channel 1 is the DO pin, and

channel 2 is the SCLK pin).

Serial Interface Register Load

Figure 15. All Bits D19 through D0 = 0

Figure 16. All Bits D19 through D0 = 1

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