MAX1497 Maxim, MAX1497 Datasheet - Page 23

• Manufacturer Part Number: MAX1497
• Description: 3.5- and 4.5-Digit / Single-Chip ADCs with LED Drivers and C Interface
• Manufacturer: Maxim

Default values: 00h
LED segment-display register 3 is an 8-bit read/write
register. When the SEG_SEL bit (in the control register)
is set to 1, the MAX1497/MAX1499 provide direct
access to individual LED segments. The bits in the LED
segment-display register determine if a segment is on
or off. Write a zero to turn on a segment and a 1 to turn
off a segment.
D3: Segment D driver bit of digit 3. The default value
turns on the LED segment (MAX1499 only).
G3: Segment G driver bit of digit 3. The default value
turns on the LED segment (MAX1499 only).
Default values: 0000h
In addition to automatic offset calibration, the
MAX1497/MAX1499 offer a user-defined custom offset
16-bit read/write register. The final result of the ADC
conversion is the input after autocalibration minus
Default values: 0000h
ADC result register 1 is a 16-bit read-only register. This
register stores the 16 MSBs of the ADC result. The data
is represented in two’s complement format.
LED Segment-Display Register 3 (Read/Write)
ADC Custom Offset-Calibration Register (Read/Write)
ADC Result Register 1 (Read Only)
MSB
MSB
D15
D15
MSB
X
3.5- and 4.5-Digit, Single-Chip ADCs with LED
D14
D14
D13
D13
______________________________________________________________________________________
X
D12
D12
D11
D11
BC_
D10
D10
D9
D9
B3
D8
D8
Drivers and µC Interface
D7
A3: Segment A driver bit of digit 3. The default value
turns on the LED segment (MAX1499 only).
C3: Segment C driver bit of digit 3. The default value
turns on the LED segment (MAX1499 only).
B3: Segment B driver bit of digit 3. The default value
turns on the LED segment (MAX1499 only).
BC_: Segment B and C driver bit of digit 3 (3.5 digits)
or Digit 4 (4.5 digits). The default value turns on the
LED segment.
X: Don’t care.
the value in the custom offset. The custom offset value
is stored in this register. D15 is the MSB. The data is
represented in two’s complement format.
For the MAX1499, the data is 16-bit and D15 is the
MSB. For the MAX1497, the data is 12-bit, D15 is the
MSB, and D4 is the LSB.
D7
C3
D6
D6
D5
D5
A3
(MAX1497)
D4
LSB
D4
D3
D3
G3
D2
D2
D1
(MAX1499)
D1
LSB
D3
LSB
D0
D0
LSB
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