DS1677 Maxim, DS1677 Datasheet - Page 4

• Manufacturer Part Number: DS1677
• Description: The DS1677 portable system controller is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip
• Manufacturer: Maxim

POWER-UP/POWER-DOWN CONSIDERATIONS
When V
device becomes fully accessible after t
When V
During power-up, when V
for 250ms (typical) to allow the power supply and microprocessor to stabilize.
ADDRESS/COMMAND BYTE
The command byte for the DS1677 is shown in Figure 2. Each data transfer is initiated by a command
byte. Bits 0 through 6 specify the address of the registers to be accessed. The MSB (bit 7) is the
Read/Write bit. This bit specifies whether the accessed byte will be read or written. A read operation is
selected if bit 7 is a zero and a write operation is selected if bit 7 is a one. The address map for the
DS1677 is shown in Figure 3.
ADDRESS/COMMAND BYTE Figure 2
RD
7
WR
CC
CC
drops below V
A6
is applied to the DS1677 and reaches a level greater than V
6
A5
5
CCSW
CC
returns to an in-tolerance condition, the
A4
, the device is switched over to the V
4
A3
RPU
3
(250ms typical). Before t
A2
2
4 of 18
A1
1
BAT
A0
0
RPU
RST
supply.
CCTP
elapses, all inputs are disabled.
pin is kept in the active state
(power-fail trip point), the
DS1677