LM49370RL/NOPB National Semiconductor, LM49370RL/NOPB Datasheet - Page 17

• Manufacturer Part Number: LM49370RL/NOPB
• Description: IC AUDIO SUBSYSTEM 1.2W 49USMDXT
• Manufacturer: National Semiconductor
• Series: Boomer®, PowerWise®r
• Type: Class Dr

Specifications of LM49370RL/NOPB

• Output Type: 1-Channel (Mono) with Mono and Stereo Headphones
• Max Output Power X Channels @ Load: 1.2W x 1 @ 8 Ohm; 52mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: 3D, Depop, I²C, I²S, Microphone, Mute, PCM, Shutdown, SPI, Standby, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 49-MicroSMDxt
• Dc: 07+
• For Use With: LM49370RLEVAL - BOARD EVALUATION LM49370RL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM49370RLTR

Method 2. SPI/Microwire Control/3–wire Control
The LM49370 can be controlled via a three wire interface consisting of a clock, data and an active low chip_select. To use this
control method connect SPI_MODE to BB_V
and use TEST_MODE/CS as the chip_select as follows:
DD
20191706
FIGURE 3. SPI Write Transaction
If the application requires read access to the register set; for example to determine the cause of an interrupt request, the GPIO2
pin can be configured as an SPI format serial data output by setting the GPIO_SEL in the GPIO configuration register (0x1Ah) to
SPI_SDO. To perform a read rather than a write to a particular address the MSB of the register address field is set to a 1, this
effectively mirrors the contents of the register field to read-only locations above 0x80h:
20191707
FIGURE 4. SPI Read Transaction
Three Wire Mode Write Bus Timing
20191709
FIGURE 5. SPI Timing
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