DEMOTS4956J STMicroelectronics, DEMOTS4956J Datasheet - Page 7

• Manufacturer Part Number: DEMOTS4956J
• Description: BOARD DEMO TS4956EIJT/EIKJT
• Manufacturer: STMicroelectronics

Specifications of DEMOTS4956J

• Amplifier Type: Class AB
• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1W x 1 @ 8 Ohm; 43mW x 2 @ 32 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: TS4956
• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.7 V to 5.5 V
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4956
• Other names: 497-6381; DEMOTS4956J

TS4956
2.1
2.1.1
I
The TS4956 uses a serial bus, which conforms to the I
powered when it is connected to the I
clock and data.
The clock and data lines are bidirectional (open-collector) with an external chip pull-up
resistor (typically 10 kΩ). The maximum clock frequency in fast-mode specified by the I
standard is 400 kHz, 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 I
connected to this pin must be equal to or less than the TS4956 power supply voltage V
The minimum value of the I2CVCC voltage is 2.7 V.
When the I2CVCC pin is connected to an I
via the I
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 I
In both cases, pins SDA and SCL must respect logic HI or logic LOW thresholds (not
floating) presented in
Table 5
Table 5.
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.
In order to write data into the TS4956 control register, after the "start" message the MCU
must send the following data:
●
●
All bytes are sent with the MSB bit first. The transfer of written data ends with a "stop"
message. When transmitting several bits of data, the data can be written without having to
repeat the "start" message or address byte with the slave address.
SDA
SCL
I2CVCC
2
C interface
A6
send byte with the I²C 7-bit slave address and with the R/W bit set low.
send the data (control register setting).
1
summarizes the pin descriptions for the I²C bus interface.
2
C bus.
I²C bus interface: pin descriptions
First byte after the START message for addressing the device
A5
0
Pin
Table 3 on page
2
C commands from the I
A4
1
2
A3
C bus), to control the chip’s functions via two wires:
4, in order for the circuit to function properly.
1
2
C voltage, the TS4956 is ready to communicate
Serial data pin
Clock input pin
I
2
C interface power supply
2
A2
C bus.
1
2
C protocol (the TS4956 must be
Functional description
Typical application schematic
A1
0
2
C interface. The voltage
A0
1
Rw
X
2
CC
C
7/55
.