ATR2731-ILSY Atmel, ATR2731-ILSY Datasheet - Page 12

• Manufacturer Part Number: ATR2731-ILSY
• Description: IC DAB ONE-CHIP FRONT END 44SSOP
• Manufacturer: Atmel

Specifications of ATR2731-ILSY

• Rf Type: DAB, Broadcast Radio
• Frequency: 70MHz ~ 260MHz
• Features: 8.5V Supply Voltage
• Package / Case: 44-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8. Simple Two-wire Bus Interface
Table 8-1.
8.1
12
Description
Simple Two-wire Bus Functions
Address
C byte 1
C byte 2
C byte 3
D byte 1
D byte 2
D byte 3
A byte 1
A byte 2
A byte 3
B byte 1
B byte 2
B byte 3
ATR2731
Simple Two-wire Bus Instruction Codes
Via its two-wire bus interface, various functions can be controlled by a microprocessor. These
functions are outlined in
tions” on page
of the pin ADR, two different two-wire bus addresses can be selected, as described in
Characteristics” on page
Figure 8-2 on page 14
AS1
n
r
TAi
TBi
TCi
CAi, CBi, CCi
OS
T
TRI
i
i
MSB
SWA
CC7
CA7
CB7
r
r
X
X
1
0
0
1
1
7
3
12. The programming information is stored in a set of internal registers. By means
SWB
CC6
CA6
CB6
Defines the two-wire bus address
Effective scaling factor (SF
Scaling factor (SF
Define the setting of a 4-bit D/A converter controlling the threshold, th1, of the
RF AGC to adjust the controlled output power
Define the setting of a 4-bit D/A converter controlling the threshold, th2,
which determines the activation voltage for the internal RF AGC
Define the setting of a 4-bit D/A converter controlling the threshold, th3, of the
IF AGC to adjust the output power
Define the setting of the three D/A converters A, B and C (i = 0, ..., 7)
OS = High switches off the tuning output
For T = High, reference signals describing the output frequencies of the refer-
ence divider and programmable divider are monitored at SWA (reference
divider) and SWC (programmable divider).
TRI = High switches off the charge pump
r
r
1
0
X
X
1
0
1
6
2
shows a typical two-wire bus pulse diagram.
Table 8-1 on page
16.
SWC
CC5
Figure 8-1 on page 14
CA5
CB5
n
n
X
X
r
r
0
X
0
11
5
1
5
ref,eff
) of the reference divider SF
CC4
CA4
CB4
n
OS
n
X
r
r
r
0
X
X
10
8
4
0
4
12, and in
eff
) of the main divider
shows the two-wire bus timing parameters;
CC3
TC3
CA3
CB3
TA3
TB3
M3
n
n
X
Section 8.1 ”Simple Two-wire Bus Func-
0
X
T
9
3
CA2
CB2
CC2
AS1
TB2
TC2
TA2
TRI
M2
n
n
n
X
14
8
2
SF
ref,eff
eff
= 4
=
CC1
TB1
TC1
CA1
CB1
I100
n
TA1
n
M1
n
n
X
0
i
13
7
1
r
i
2
2
i
i
4904A–DAB–03/06
“Electrical
LSB
CC0
TC0
CA0
CB0
TB0
TA0
n
I50
M0
n
n
0
X
12
6
0