Datasheet

ADC081C021, ADC081C027

SNAS447C –FEBRUARY 2008–REVISED MARCH 2013

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Address Pointer Register

The address pointer determines which of the data registers is accessed by the I

C interface. The first data byte

of every write operation is stored in the address pointer register. This value selects the register that the following

data bytes will be written to or read from. Only the three LSBs of this register are variable. The other bits must

always be written to as zeros. After a power-on reset, the pointer register defaults to all zeros (conversion result

Default Value: 00h

P7 P6 P5 P4 P3 P2 P1 P0

0 0 0 0 0 Register Select

P2 P1 P0 REGISTER

0 0 0 Conversion Result (read only)

0 0 1 Alert Status (read/write)

0 1 0 Configuration (read/write)

0 1 1 Low Limit (read/write)

1 0 0 High Limit (read/write)

1 0 1 Hysteresis (read/write)

1 1 0 Lowest Conversion (read/write)

1 1 1 Highest Conversion (read/write)

Conversion Result Register

This register holds the result of the most recent conversion. In the normal mode, a new conversion is started

whenever this register is read. The conversion result data is in straight binary format with the MSB at D11.

Pointer Address 00h (Read Only)

Default Value: 0000h

D15 D14 D13 D12 D11 D10 D9 D8

Alert Flag Reserved Conversion Result [7:4]

D7 D6 D5 D4 D3 D2 D1 D0

Conversion Result [3:0] Reserved

Bits Name Description

15 Alert Flag This bit indicates when an alert condition has occurred. When the Alert Bit Enable is set in the

Configuration Register, this bit will be high if either alert flag is set in the Alert Status Register.

Otherwise, this bit is a zero. The I

C controller will typically read the Alert Status register and other data

registers to determine the source of the alert.

14:12 Reserved Always reads zeros.

11:4 Conversion Result The Analog-to-Digital conversion result. The Conversion result data is a 8-bit data word in straight

binary format. The MSB is D11.

3:0 Reserved Always reads zeros.

Product Folder Links: ADC081C021 ADC081C027