MICRF501 datasheet(17/18 Pages) MICREL

17 / 18 page

March 2003

MICRF501

Micrel

Example 2. f

RF = 434.245MHz, fRF = 10.00MHz. FSK modu-

lation is applied to the VCO.

143

106

143

106

RxFilt

Pa2

Pa1

Pa0

ByLNA

011110

Ref6

Ref5

Ref4

Ref3

Ref2

Ref1

000000

Ref0

Cpmp1 Cpmp0

Fc1

Fc0

OutS2

001100

OutS1

OutS0

Mod1

Mod0

000011

000001

Binary form: (MSB to the left):

Tx:

011011 011011 000010001111

000010001111 0001101010 0001101010

011110000000001100000011

Rx:

011011 011011 000010001111

000010001111 0001101010 0001101010

011110000000001100000001

With modulation applied to the VCO, A, N and M values

corresponding to the receive frequency have to be found. The

same set of A, N and M values are used in all modes.

Programming After Battery Reset

In order to ensure a successful programming after VDD has

been zero volts, the PDEXT needs to be kept low during the

first programming sequence. This can be done by a seperate

I/O-line from a microcontroller, or a RC circuit on the PDEXT

pin to the VDD (a capacitor between PDEXT and ground and

a resistor between PDEXT and VDD). Using the latter method,

R and C values need to be chosen so that the voltage on the

PDEXT pin is lower then VDD/2 when the control word is

loaded into the parallel register. (See Figure 10.)

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