MAX1497 Maxim, MAX1497 Datasheet - Page 24

• 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
ADC result register 2 is an 8-bit read-only register. This
register stores the 4 LSBs of the ADC result.
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
ADC Result Register 2 (Read Only)
LED Data Register (Read/Write)
Default values: 0000h
The LED data register is a 16-bit read/write register.
This register updates from ADC result register 1 or from
the serial interface by selecting the SPI/ADC bit in the
control register. The data is represented in two’s com-
plement format.
PEAK Register (Read Only)
Default values: B1E0h
The peak data register is a 16-bit read only register. Set
the PEAK bit to 1 to enable the PEAK function. This reg-
ister stores the peak value of the ADC conversion
result. First, the current ADC result is saved to the
PEAK register, then the new ADC conversion result is
compared to this value. If the new value is larger than
the value in the peak register, the MAX1497/MAX1499
save the new value to the peak register. If the new
24
MSB
D15
MSB
D15
MSB
______________________________________________________________________________________
D3
D14
D14
D13
D13
D2
D12
D12
D11
D11
D1
D10
D10
D9
D9
LSB
D0
D8
D8
Use this result with the result in ADC result-register 1 to
form a 20-bit two’s complement conversion result.
D7
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, followed by 4 trailing sub-bits.
D7
value is less than the value in the peak register, the
value in the peak register remains unchanged. Set the
PEAK bit to zero to clear the value in the PEAK register.
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 followed by 4 trailing sub-bits.
0
D6
D6
D5
D5
(MAX1497)
(MAX1497)
0
D4
D4
LSB
LSB
D3
D3
0
D2
D2
(MAX1499)
(MAX1499)
D1
D1
LSB
LSB
0
D0
D0