TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 23

• 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

TS4975
All bytes are sent with MSB bit first. The transfer of written data ends with a “stop” message.
When transmitting several data, the data can be written with no need to repeat the “start”
message and addressing byte with the slave address.
In order to read data from the TS4975, after the “start” message, the MCU must send and
receive the following data:
All bytes are read with MSB bit first. The transfer of read data is ended with “stop” message.
When transmitting several data, the data can be read with no need to repeat the “start”
message and the byte with slave address. In this case the value of control register is read
repeatedly.
When the thermo shutdown or pop and click reduction is active, specific values are read from
the TS4975 (see
shutdown on page 32
Figure 59. I²C write/read operations
Table 10.
1. SD = Shutdown Mode
In1 = Audio Input 1
In2= Audio Input2
G = Gain from Audio Input 1and Input 2 to Output1 and Output2
Output Mode #
send byte with the I²C 7-bit slave address and with a high level for the R/W bit
receive the data (control register value)
0
1
2
3
4
5
6
7
8
Ouput mode selection: G from -34 dB to + 18dB (by steps of 4dB)
SDA
SDA
Section 4.9: Pop and click performance on page 31
Start condition
Start condition
S
S
S
).
1
1
1
1
1
1
SLAVE ADDRESS
SLAVE ADDRESS
0
0
0
Headphone Output 1
0
0
0
1
1
1
G x In1
G x In2
G x In1
G x In2
G x In1
G x In2
1
1
1
SD
SD
SD
A0
A0
A0
R/W
R/W
R/W
0
0
0
Acknowledge
Acknowledge
from Slave
from Slave
A
A
A
Volume Control
Volume Control
settings
settings
D7 D6 D5 D4
D7 D6 D5 D4
D7 D6 D5 D4
CONTROL REGISTERS
CONTROL REGISTERS
Phantom Ground
Phantom Ground
settings
settings
D3
D3
D3
D2
D2
D2
Output
Output
Mode settings
Mode settings
D1
D1
D1
Headphone Output 2
D0
D0
D0
Application Information
Acknowledge
Acknowledge
from Slave
from Slave
and
A
A
A
Stop condition
Stop condition
P
P
P
G x In2
G x In1
G x In1
G x In2
G x In1
G x In2
Section 4.10: Thermo
SD
SD
SD
(1)
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