T4260-ILSH Atmel, T4260-ILSH Datasheet - Page 10

• Manufacturer Part Number: T4260-ILSH
• Description: IC AM/FM FRONT END W/PLL 44SSOP
• Manufacturer: Atmel

Specifications of T4260-ILSH

• Frequency: AM, FM
• Modulation Or Protocol: AM, FM
• Applications: AM/FM Radio Receiver
• Current - Receiving: 85mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 8 V ~ 10 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -

8. 3-wire Bus Description
Figure 8-1.
10
EN
16-bit command
EN
CLK
24-bit command
EN
DATA
CLK
DATA
DATA
CLK
T4260
8-bit command
e.g. R-divider
3-wire Pulse Diagram
MSB
MSB
MSB
2
7
2
6
2
5
The register settings of the T4260 are programmed by a 3-wire bus protocol. The bus protocol
consists of separate commands. A defined number of bits is transmitted sequentially during
each command.
One command is used to program all bits of one register. The different registers available (see
chapter
(number of transmitted bits) and by two address bits that are unique to each register of a given
length. 8-bit registers are programmed by 8-bit commands, 16-bit registers are programmed by
16-bit commands and 24-bit registers are programmed by 24-bit commands.
Each bus command starts with a falling edge on the enable line (EN) and ends with a rising edge
on EN. EN has to be kept LOW during the bus command.
The sequence of transmitted bits during one command starts with the MSB of the first byte and
ends with the LSB of the last byte of the register addressed. To transmit one bit (0/1), DATA has
to be set to the appropriate value (LOW/HIGH) and a LOW-to-HIGH transition has to be per-
formed on the clock line (CLK) while DATA is valid. The DATA is evaluated at the rising edges of
CLK. The number of LOW-to-HIGH transitions on CLK during the LOW period of EN is used to
determine the length of the command.
BYTE 1
BYTE 1
BYTE 1
2
4
2
3
“3-wire Bus Data Transfer” on page
2
2
2
1
LSB
LSB
LSB
2
R-Divider
0
MSB
MSB
X
X
2
13
2
BYTE 2
12
BYTE 2
2
11
2
10
2
9
LSB
LSB
12) are addressed by the length of the command
2
8
MSB
1
Addr.
0
PDFM
PDAM
Fract.
BYTE 3
2
3
VCO-Divider
2
2
2
1
LSB
2
0
4528N–AUDR–11/09