U2731B Datasheet, PDF (12/25 Pages) ATMEL Corporation – DAB ONE- CHIP FRONT END

Simple Two-wire Bus
Data Transfer
I50 and I100 define the charge pump current:
Table 4. Current of Charge Pump
I50
LOW
HIGH
LOW
HIGH
I100
LOW
LOW
HIGH
HIGH
Charge-pump Current
(nominal)/µA
50
100
150
200
Mi defines the operation mode:
Table 5. Mode Selection
M3
M2
M1
M0
Mode
LOW
LOW
X
X
LOW
HIGH
X
X
HIGH
HIGH
X
X
f_LO,IFMIX = f_ref
f_LO,IFMIX = 2 × f_ref
IF mixer switched off
X
X
LOW
LOW
RF mixer A active, f_LO,RFMIX = f_VCO
X
X
HIGH
LOW
RF mixer B active, f_LO,RFMIX = f_VCO
X
X
HIGH
HIGH
RF mixer B active, f_LO,RFMIX = f_VCO/2
Note: SWα = HIGH switches on the output current (α = A, B, C)
Format:
START - ADR - ACK - <instruction set> - STOP
The <instruction set> consists of a sequence of A bytes, B bytes, C bytes and D bytes
each followed by ACK. Always a triplet of these bytes (A, B, C or D) has to be completed
before a new triplet is started. If no new triplet is started the transmission can be finished
before the current triplet is finished.
Examples:
START - ADR - ACK - DB1 - ACK - DB2 - ACK - DB3 - ACK - CB1 - ACK - CB2 - ACK -
CB3 - ACK - AB1 - ACK - AB2 - ACK - AB3 - ACK - BB1 - ACK - BB2 - ACK - BB3 - ACK
- STOP
START - ADR - ACK - CB1 - ACK - CB2 - ACK - STOP
However:
START - ADR - ACK - DB1 - ACK - CB1 -ACK - STOP is not allowed.
Description:
START
STOP
ACK
ADR
αBi
Start condition
Stop condition
Acknowledge
Address byte
α byte i (α = A, B, C, D; i = 1, 2, 3)
12 U2731B
4671C–DAB–06/04