TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 22

• Manufacturer Part Number: TS4975EIJT
• Description: IC AMP AUDIO .04W AB 12FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4975EIJT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 40mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, I²C, Standby, Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 12-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5199-2; TS4975EIJT

Application Information
4
4.1
4.1.1
22/36
Application Information
The TS4975 integrates 2 monolithic power amplifiers. The amplifier output can be configured
as either SE (single-ended) capacitively-coupled output or PHG (phantom ground) output.
Figure 1 on page 3
Section 4.2: Output configuration
This chapter gives information on how to configure the TS4975 in application.
I²C bus interface
The TS4975 uses a serial bus, which conforms to the I²C protocol (the TS4975 must be
powered when it is connected to I²C bus), to control the chip’s functions with two wires: Clock
and Data. The Clock line and the Data line are bi-directional (open-collector) with an external
chip pull-up resistor (typically 10 kOhm). The maximum clock frequency in Fast-mode specified
by the I²C standard is 400kHz, which TS4975 supports. In this application, the TS4975 is
always the slave device and the controlling micro controller MCU is the master device.
The ADD pin is allows one to set one of two possible 7-bit device addresses. This setting is
needed for when a number of chips are connected to the same bus (for example two TS4975
devices), to avoid address conflicts. The two possible TS4975 addresses are:
Table 8
Table 8.
I²C bus operation
The host MCU can write into the TS4975 control register to control the TS4975, and read from
the control register to get a configuration from the TS4975. The TS4975 is addressed by the
byte consisting of 7-bit slave address and R/W bit.
Table 9.
In order to write data into the TS4975, after the “start” message, the MCU must send the
following data:
A6
$CCh when the ADD pin is connected to logic low voltage,
$CEh when ADD pin is connected to logic high voltage.
send byte with the I²C 7-bit slave address and with a low level for the R/W bit
send the data (control register setting)
1
SDA
ADD
SCL
Pin
summarizes the pin descriptions for the I²C bus interface.
I²C bus interface pin descriptions
The first byte after the START message for addressing the device
A5
This is the serial data pin
This is the clock input pin
User-setable portion of device’s I2C address
1
and
Figure 2 on page 4
A4
0
describes these configurations.
A3
0
show schemes of these two configurations and
Functional Description
A2
1
A1
1
A0
A0
TS4975
R/W
X