MAX1620 Datasheet, PDF (13/20 Pages) Maxim Integrated Products – Digitally Adjustable LCD Bias Supplies

Digitally Adjustable LCD Bias Supplies
Table 1. MAX1621 Configuration Byte
with REGSEL = 0 (write to SUS register)
BIT
NAME
POR
STATE*
DESCRIPTION
7
REGSEL
—
6 SUS-SHDN
0
5 SUS-LCDON
0
4
D4 (MSB)
1
3
D3
0
2
D2
0
1
D1
0
0
D0
0
Register Select. A zero in
this bit writes the next two
bits into the SUS register
and the remaining five bits
into the DAC register
(Figure 7).
With SUS = low,
1 = operating, and
0 = shutdown.
With SUS = low,
1 = LCD on, and
0 = LCD off.
DAC Input Data
*Initial register state after power-up.
Table 2. MAX1621 Configuration Byte
with REGSEL = 1 (write to OPR register)
BIT
NAME
POR
STATE*
DESCRIPTION
7
REGSEL
—
6 OPR-SHDN
1
5 OPR-LCDON
1
4
D4 (MSB)
1
3
D3
0
2
D2
0
1
D1
0
0
D0
0
Register Select. A one in
this bit writes the next two
bits into the OPR register
and the remaining five bits
into the DAC register
(Figure 7).
With SUS = high,
1 = operating, and
0 = shutdown.
With SUS = high,
1 = LCD on, and
0 = LCD off.
DAC Input Data
*Initial register state after power-up.
Table 3. MAX1621 Status Bits
BIT
NAME
DESCRIPTION
If the voltage applied to POK is
7
POK
greater than 0.992V and the
MAX1621 is not shut down, this bit
returns 1; otherwise, it returns 0.
6
—
Reserved for future use.
5
—
Reserved for future use.
4
D4 (MSB)
3
D3
2
D2
DAC Register Data
1
D1
0
D0
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