ATR2731 Datasheet, PDF (13/26 Pages) ATMEL Corporation – DAB One-chip Front End

I50 and I100 define the charge pump current:
ATR2731
Table 8-2. Current of Charge Pump
I50
Low
High
Low
High
I100
Low
Low
High
High
Mi defines the operation mode:
Charge-pump Current
(nominal) [µA]
50
100
150
200
Table 8-3. Mode Selection
M3
Low
Low
High
X
X
X
M2
Low
High
High
X
X
X
M1
X
X
X
Low
High
High
M0
X
X
X
Low
Low
High
Mode
f_LO,IFMIX = f_ref
f_LO,IFMIX = 2 × f_ref
IF mixer switched off
RF mixer A active, f_LO,RFMIX = f_VCO
RF mixer B active, f_LO,RFMIX = f_VCO
RF mixer B active, f_LO,RFMIX = f_VCO / 2
Note: SWα = High switches on the output current (α = A, B, C)
8.2 Simple Two-wire Bus Data Transfer
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 fol-
lowed by ACK. A triplet of these bytes (A, B, C or D) must always 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)
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