Data Sheet

NAU7802 24-bit ADC
Nuvoton Confidential - 18 - Revision 1.7
8.5 NAU7802 Streaming Data Mode
8.5.1 Enabling the Streaming I2C Mode
 Power Up the chip
o Write 0x00 = 0x06 (PU analog and PU digital)
o (read back 0x00 bit 3 to make sure chip is powered up)
 Enable Streaming I2C Mode
o Write REG11[7]=1 to enable streaming mode 1, or Write REG11[7]=1 and
REG11[6]=1 and REG15[7]=1 to enable streaming mode 2
o (read back 0x1D bit 7 to make sure the streaming I2C mode is active)
8.5.2 Streaming I2C Mode R/W Protocol 1
When REG0x11[7] CRSD=1, I2C is IDLE and a conversion is complete, NAU7802 will
pull SDA/SDIO low to inform the host a conversion is complete. Host should respond by
pulling SDA/SDIO low and pulling SCK low to initial an I2C “start” condition. When
seeing SCK pulled low by host, NAU7802 will release the SDA/SDIO. Host can continue
the standard I2C transaction with NAU7802
ID[6:0] AckWr
ADC OUT
REG Addr[7:0]
Ack ID[6:0] AckRd ADCout[23:16]
Host
Ack
Host
Ack
ADCout[15:8] ADCout[7:0]
Repeat
START
When I2C is IDLE and
conversion complete
NAU780X pulls SDA
low until seeing host
pulling SCK low
SDIO
SCLK
START
STOP
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