U2731B-NFN
| Model | U2731B-NFN |
| Description | DAB ONE- CHIP FRONT END |
| PDF file | Total 25 pages (File size: 654K) |
| Chip Manufacturer | ATMEL |
U2731B
Simple Two-wire Bus
Interface
Via its two-wire bus interface, various functions can be controlled by a microprocessor.
These functions are outlined in the following table “Simple Two-wire Bus Instruction
Codes” on page 11 and in the section “Simple Two-wire Bus Functions” on page 11. The
programming information is stored in a set of internal registers. By means of the Pin
ADR, two different two-wire bus addresses can be selected as described in the section
“Electrical Characteristics”. In Figure 6 on page 19, the two-wire bus timing parameters
are explained, Figure 7 on page 20 shows a typical two-wire bus pulse diagram.
Table 3.
Simple Two-wire Bus Instruction Codes
Description
Address
A byte 1
A byte 2
A byte 3
B byte 1
B byte 2
B byte 3
C byte 1
C byte 2
C byte 3
D byte 1
D byte 2
D byte 3
MSB
1
0
X
X
0
r
7
r
3
1
CA7
CB7
1
SWA
CC7
1
0
X
X
1
r
6
r
2
0
CA6
CB6
1
SWB
CC6
0
X
n
11
n
5
X
r
5
r
1
X
CA5
CB5
0
SWC
CC5
0
X
n
10
n
4
r
8
r
4
r
0
X
CA4
CB4
OS
X
CC4
0
X
n
9
n
3
TA3
TB3
TC3
X
CA3
CB3
T
M3
CC3
AS1
n
14
n
8
n
2
TA2
TB2
TC2
X
CA2
CB2
TRI
M2
CC2
0
n
13
n
7
n
1
TA1
TB1
TC1
X
CA1
CB1
I100
M1
CC1
LSB
0
n
12
n
6
n
0
TA0
TB0
TC0
X
CA0
CB0
I50
M0
CC0
Simple Two-wire Bus
Functions
AS1
n
i
r
i
TAi
Defines the two-wire bus address
Deffective scaling factor (SFeff) of the main divider
SF
eff
=
n
∑
i
×
2
i
Scaling factor (SF
ref,eff
) of the reference divider SF
ref,eff
= 4
×
r
i
2
i
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 reference divider and programmable divider are monitored at
SWA (reference divider) and SWC (programmable divider).
TRI = HIGH switches off the charge pump
11
TBi
TCi
CAi, CBi, CCi
OS
T
TRI
4671C–DAB–06/04
Related PDFs
| Model | Description | Manufacturer | Operation |
|---|---|---|---|
 U2731B-NFNG1
|
DAB ONE- CHIP FRONT END | ATMEL | Preview |
