Rainbow-electronics DS1670 Bedienungsanleitung PDF herunterladen (Seite 4)

DS1670

4 of 17

POWER-UP/POWER-DOWN CONSIDERATIONS

The DS1670 was designed to operate with a power supply of 3.3 volts. When 3.3 volts are applied within

nominal limits, the device becomes fully accessible after t

RPU

(250 ms typical). Before t

RPU

elapses, all

inputs are disabled. When V

drops below 2.88 volts (typical), the RST pin is driven low. When V

drops below the lower of 2.7 volts (typical) or the battery voltage, the device is switched over to the

backup power supply.

During power up, when V

returns to an in-tolerance condition, the RST pin is kept in the active state

for 250 ms (typical) to allow the power supply and microprocessor to stabilize.

ADDRESS/COMMAND BYTE

The command byte for the DS1670 is shown in Figure 2. Each data transfer is initiated by a command

byte. Bits 0 through 6 specify the addresses 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 0 and a write operation is selected if bit 7 is a 1. The address map for the DS1670 is

shown in Figure 3.

ADDRESS/COMMAND BYTE Figure 2

76543 2 1 0

A6 A5 A4 A3 A2 A1 A0

DS1670 ADDRESS MAP Figure 3

BIT 7 BIT 0

00 0 10 SECONDS SECONDS

01 0 10 MINUTES MINUTES

10 HR

02 0

A/P

10 HR HOURS

03 0 0 0 0 0 DAY

04 0 0 10 DATE DATE

05 0 0 0 10

MO.

MONTH

06 10 YEAR YEAR

07 M 10 SEC ALARM SECONDS ALARM

08 M 10 MIN ALARM MINUTES ALARM

10 HR

09 M

A/P

10 HR HOUR ALARM

0A M 0 0 0 DAY ALARM

0B CONTROL REGISTER

0C STATUS REGISTER

0D WATCHDOG REGISTER

0E ADC REGISTER

RESERVED

1 2 3 4 5 6 7 8 9 ... 16 17

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