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PDF TS4956 Data sheet ( Hoja de datos )
| Número de pieza | TS4956 | |
| Descripción | Stereo audio amplifier system | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TS4956
Stereo audio amplifier system with I2C bus interface
■ Operating from VCC = 2.7 V to 5.5 V
■ I²C bus control interface
■ 38 mW output power @ VCC = 3.3 V,
THD = 1%, F = 1 kHz, with 16Ω Load
■ Ultra low consumption in standby mode: 0.5 µA
■ Digital volume control range from +12 dB to
-34 dB
■ 32-step digital volume control
■ Stereo loudspeaker option by I2C
■ 8 different output mode selections
■ Pop & click reduction circuitry
■ Flip-chip package, 18 bumps with 300 µm
diameter
■ Lead-free flip chip package
■ Output power limitation on headphone for
eardrum damage consideration
Description
The TS4956 is a complete audio system device
with three dedicated outputs, one stereo
headphone, one loudspeaker drive and one mono
line for a hands-free set. The stereo headphone is
capable of delivering more than 25 mW per
channel of continuous average power into 16Ω
single-ended loads with 0.3% THD+N from a 5 V
power supply. The device functions are controlled
via an I²C bus, which minimizes the number of
external components needed.
The overall gain and the different output modes of
the TS4956 are controlled digitally by the control
registers which are programmed via the I²C
interface. It has also an internal thermal shutdown
protection mechanism.
TS4956 - Flip-Chip18
Pin connections (top view)
PGH
RIN
MIN
MIP
LHP-
LIN
SRP+
GND
VCC
VCC
GND
MLO
RHP+
SDA
BYPASS
I2CVCC
SRN-
SCL
Applications
■ Mobile phones (cellular / cordless)
■ PDAs
■ Laptop / notebook computers
■ Portable audio devices
Device summary table
Part Number
TS4956EIJT
Temperature Range
-40°C to +85°C
Package
Lead free flip-chip18
Packing
Tape & Reel
Marking
56
May 2006
Rev. 3
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1 page  
TS4956
Typical application schematic
2.1
I2C interface
The TS4956 uses a serial bus, which conforms to the I²C protocol (the TS4956 must be
powered when it is connected to I²C bus), to control the chip’s functions via two wires: Clock
and Data.
The Clock line and the Data line are bidirectional (open-collector) with an external chip pull-
up resistor (typically 10 kΩ). The maximum clock frequency in fast-mode specified by the I²C
standard is 400kHz, and this frequency is supported by the TS4956. In this application, the
TS4956 is always the slave device and the controlling MCU is the master device.
The I2CVCC pin determines the power supply of the TS4956’s I2C interface. The voltage
connected to this pin must be equal or less than the TS4956 power supply voltage VCC. The
minimum value of the I2CVCC voltage is 2.7V.
When the I2CVCC pin is connected to an I2C voltage, the TS4956 is ready to communicate
via the I2C bus.
When the I2CVCC pin is connected to the ground, the TS4956 is in total standby mode, with
an ultra low standby current on the order of a few nanoamperes. In this condition the
TS4956 cannot receive I2C command from the I2C bus.
In both cases, pins SDA and SCL must respect logic HI or logic LOW thresholds (not
floating) presented in Table 3 on page 2, in order for the circuit to function properly.
Table on page 5 summarizes the pin descriptions for the I²C bus interface.
Table 5. I²C bus interface: pin descriptions
Pin Functional description
SDA
SCL
I2CVCC
This is the serial data pin
This is the clock input pin
I2C interface power supply
2.1.1
I²C operation description
The host MCU can write into the TS4946 control register to control the TS4956 and read
from the control register to get the current configuration of the TS4956. The TS4956 is
addressed by a single byte consisting of a 7-bit slave address and an R/W bit. The TS4956
control register address is $5Dh.
Table 6.
A6
1
The first byte after the START message for addressing the device
A5 A4 A3 A2 A1 A0 Rw
011 1 01X
In order to write data into the TS4956 control register, after the “start” message the MCU
must send the following data:
● send byte with the I²C 7-bit slave address and with the R/W bit set low
● send the data (control register setting)
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.
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TS4956
Electrical characteristics
Table 11. VCC = +3.3 V, GND = 0V, Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
Mode 1, 2, No input signal, no load
Mode 3, No input signal, no load
ICC Supply Current
Mode 4, No input signal, no load
Modes 5, 6, No input signal, no load
Mode 7, No input signal, no load
ISTBY Standby Current
VOO Output Offset Voltage
Headphone Output Power
(Phantom Ground Mode)
Pout
BTL, Speaker Output
Power
MLO Output Power
THD+N
Total Harmonic Distortion
+ Noise
PSRR
Power Supply Rejection
Ratio(2)
Crosstalk Channel Separation
No input signal
No input signal
Modes 1, 2
Speaker Output, RL = 8Ω
Mode 3
Headphone Outputs, RL = 16Ω
Mode 4
Headphone Outputs, RL = 16Ω
Mode 7
BTL, Speaker Output, RL = 8Ω
Modes 3, 4
THD+N = 1% max, F = 1kHz, RL = 16Ω
THD+N = 1% max, F = 1kHz, RL = 32Ω
Modes 1, 2, 7
THD+N = 1% max, F = 1kHz, RL = 8Ω
Modes 5, 6
THD+N = 1% max, F = 1kHz, RL = 16Ω
THD+N = 1% max, F = 1kHz, RL = 32Ω
G = +1.5dB, 20Hz < F < 20kHz
Modes 1, 2, 7, RL = 8Ω, Pout = 300mW
Modes 3, 4, RL = 16Ω, Pout = 15mW
Modes 5, 6, RL = 16Ω, Pout = 50mW
F = 217Hz, G = +1.5dB, Vripple = 200mVpp,
Inputs Grounded, Cb = 1µF
Mode 1, Speaker output, RL = 8Ω
Mode 2, Speaker output, RL = 8Ω
Mode 3, Headphone outputs, RL = 16Ω
Mode 4, Headphone outputs, RL = 16Ω
Mode 5, MLO output, RL = 16Ω
Mode 6, MLO output, RL = 16Ω
Mode 7, BTL, Speaker outputs, RL = 8Ω
Mode 4
F = 1kHz, RL = 16Ω, Pout = 15mW
F = 20Hz to 20kHz, RL = 16Ω, Pout = 15mW
Mode 7
F = 1kHz, RL = 8Ω, Pout = 300mW
F = 20Hz to 20kHz, RL = 8Ω, Pout = 300mW
32
30
430
58
32
3.6
4.8
4.6
1.8
6
0.5
5
5
5
5
38(1)
36(1)
450
65
38
0.5
0.5
0.5
63
57
63
77
64
58
74
50
50
80
60
4.7
6.2
6
2.4
7.8
2
50
50
20
20
dB
mA
µA
mV
mW
%
dB
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