LM4937RL/NOPB National Semiconductor, LM4937RL/NOPB Datasheet - Page 11

• Manufacturer Part Number: LM4937RL/NOPB
• Description: IC AUDIO SUBSYSTM 1.25W 36USMDXT
• Manufacturer: National Semiconductor
• Series: Boomer®r
• Type: Class ABr

Specifications of LM4937RL/NOPB

• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1.25W x 1 @ 8 Ohm; 80mW x 2 @ 32 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Depop, Differential Inputs, I²C, I²S, Mute, Shutdown, SPI, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 36-MicroSMDxt
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM4937RLTR

System Control
The LM4937 is controlled via either a two wire I
This interface is used to configure the operating mode, interfaces, data converters, mixers and amplifiers. The LM4937 is controlled
by writing 8 bit data into a series of write-only registers, the device is always a slave for both type of interfaces.
THREE WIRE, SPI INTERFACE (MODE = 1)
When the part is configured as an SPI device and the enable (ENB) line is lowered the serial data on SDI is clocked in on the rising
edge of the SCK line. The protocol used is 16bit, MSB first. The upper 8 bits (15:8) are used to select an address within the device,
the lower 8 bits (7:0) contain the updated data for this register.
TWO WIRE I
2
C COMPATIBLE INTERFACE (MODE = 0)
Three Wire Mode Write Bus Transaction
FIGURE 2. Three Wire Mode Write Bus
Two Wire Mode Write Bus Transaction
Three Wire Mode Write Bus Timing
2
C compatible interface or three wire SPI interface, selectable with the MODE pin.
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