MICRF500 datasheet(17/18 Pages) MICREL

17 / 18 page

March 2003

MICRF500

Micrel

Example 2. f

RF = 869.0MHz, fRF = 10.00MHz. FSK modula-

tion is applied to the VCO.

135

100

135

100

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:

110010 110010 000010000111

000010000111 0001100100 0001100100

01011110000000010100000011

Rx:

111011 111011 000010001110

000010001110 0001101010 0001101010

01011110000000010100000001

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 V

DD has

been zero volts, the P

DEXT needs to be kept low during the

first programming sequence. This can be done by a separate

110-line from a microcontroller, or a RC circuit on the P

DEXT

pin to V

DD (A capcitor between PDEXT and VDD). Using the

latter method, R and C values need to be chosen so that the

voltage on the P

DEXT pin is lower than VDD/2 when the

controller word is loaded into the parallel register (see Figure

10).

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