MICRF505BML datasheet(26/27 Pages) MICREL

Part #	MICRF505BML

Description	868MHz and 915MHz ISM Band Transceiver

PDF	27 Pages

Scroll/Zoom	100%

Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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26 / 27 page

MICRF505

Micrel

M9999-051304

May 13, 2004

XCO_Present (5-bit) holds present value in XCO_tune bits

XCO_Step

(4-bit) holds Increment/decrement of XCO_tune bits

XCO_Sign (1 bit) holds POS or NEG (increment/decrement) increasing LO

is done by reducing the XCO_tune value

XCO TUNE PROCEDURE

INIT:

XCO_Present = 0

XCO_Step

= 32

XCO_Sign

= NEG

Control_Word =

Default RX, clocks match transmitter

LOOP:

XCO_Step = XCO_Step/2

XCO_Sign == POS?

Yes —> XCO_Present -= XCO_Step // increase LO

No —> XCO_Present += XCO_Step // decrease LO

XCO_tune bits = XCO_Present

Program RFChip

Delay > n bits

Read FEE

FEE > 0?

Yes —> XCO_Sign = POS

No —> XCO_Sign = NEG // negative or == 0

XCO_Step > 1?

Yes —> Branch to LOOP

No —>

XCO_Sign == POS?

Yes —> XCO_Present -= 1

Branch to FIN

FIN:

RETURN, return-value = XCO_Present

MICRF505BML Datasheet(PDF) 26 Page - Micrel Semiconductor