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TDA7705 数据表(PDF) 13 Page - STMicroelectronics

部件名 TDA7705
功能描述  Highly integrated tuner for AM/FM car radio
PDF  42 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7705 数据表(HTML) 13 Page - STMicroelectronics

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TDA7705
Function description
Doc ID 15938 Rev 9
13/42
If I2C serial bus is chosen as means of communication with the controlling device, two chip
addresses are possible: 0xC2/C3 or 0xC8/C9, depending on the initial configuration of pins
35 and 39.
The status of pins 35 and 39 during the reset phase can be set to:
high, through external <10 k
 resistors tied to 3.3V (pin 32), or
low, by not forcing any voltage on them from outside, as 50 kohm internal pull-down
resistors are present on said pins.
To make sure the boot mode is correctly latched up at start-up, it is advisable to keep the
RSTN line low until the IC supply pins have reached their steady state, and then for an
additional time Treset (see Section 3.4.8).
2.13.2
I2C bus protocol
I2C requires two signals: clock (SCL) and data (SDA - bidirectional). The protocol requires
an acknowledge after any 8-bit transmission.
A "write" communication example is shown in the figure below, for an unspecified number of
data bytes (see the relevant technical documentation for frame structure description):
Figure 3.
I2C "write" sequence
Table 3.
Boot mode pin configuration
Configuration:
I2C (addr. 0 x C2)
I2C (addr. 0 x C8)
SPI
Pin
at reset
operation
at reset
operation
at reset
operation
39
RDSINT
0
in
RDS interrupt
out
0
in
RDS interrupt
out
1
in
RDS interrupt
out
37
SCL
x
I2C SCL
in
x
I2C SCL
in
x
SPI CLK
in
36
SDA
x
I2C SDA
in/out
x
I2C SDA
in/out
x
SPI MOSI
in
35
(SPI_MISO)
0
in
-
1
in
-
1
in
SPI MISO
out
34
(SPI_CS)
x
-
x
-
x
SPI SS
in
ACK
data
STOP
clk1
clk2
…
clk8
clk9
clk1
clk2
START
ACK
d7
d6
address
a0
…
d0
…
clk8
clk9
a7
a6
…
SCL
SDA



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