MAX1497 Maxim, MAX1497 Datasheet - Page 21

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

LED segment-display register 1 is a 16-bit read/write
register. When the LED 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.
DP1: Segment DP driver bit of digit 1. The default value
turns on the LED segment.
E0: Segment E driver bit of digit 0. The default value
turns on the LED segment.
F0: Segment F driver bit of digit 0. The default value
turns on the LED segment.
D0: Segment D driver bit of digit 0. The default value
turns on the LED segment.
G0: Segment G driver bit of digit 0. The default value
turns on the LED segment.
A0: Segment A driver bit of digit 0. The default value
turns on the LED segment.
Default values:
The underrange data register is 16-bit read/write regis-
ter (D15 is the MSB). When the conversion result falls
below the value in the underrange register, the UNDR
bit in the status register sets to 1. The LED shows a -1
Underrange Register (Read/Write)
LED Segment-Display Register 1 (Read/Write)
MSB
MSB
D15
Bit 15
Bit 7
C0
A1
3.5- and 4.5-Digit, Single-Chip ADCs with LED
D14
D13
______________________________________________________________________________________
Bit 14
Bit 6
G1
A0
8300h (for 3.5-digit, -2000)
B1E0h (for 4.5-digit, -20,000)
D12
D11
Bit 13
Bit 5
G0
D1
D10
D9
Bit 1
Bit 4
D0
F1
D8
Drivers and µC Interface
D7
C0: Segment C driver bit of digit 0. The default value
turns on the LED segment.
B0: Segment B driver bit of digit 0. The default value
turns on the LED segment.
X: Don’t care.
DP2: Segment DP driver bit of digit 2. The default value
turns on the LED segment.
E1: Segment E driver bit of digit 1. The default value
turns on the LED segment.
F1: Segment F driver bit of digit 1. The default value
turns on the LED segment.
D1: Segment D driver bit of digit 1. The default value
turns on the LED segment.
G1: Segment G driver bit of digit 1. The default value
turns on the LED segment.
A1: Segment A driver bit of digit 1. The default value
turns on the LED segment.
followed by four dashes for the MAX1499 or a -1 fol-
lowed by three dashes for the MAX1497 (Table 4).
The data is represented in two’s complement format.
Default values: 0000h
Bit 11
Bit 3
E1
F0
D6
D5
Bit 10
Bit 2
DP2
E0
D4
D3
Bit 9
Bit 1
DP1
X
D2
D1
Bit 8
Bit 0
B0
0
LSB
LSB
D0
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