Rainbow-electronics DS1672 Manuel d'utilisateur télécharger pdf (Page 5)

DS1672

5 of 12

POWER-UP/POWER-DOWN CHARACTERISTICS

= -40°C to +85°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Detect to RST (V

Falling)

RPD

10 µs

Detect to RST (V

Rising)

RPU

250 ms 11

Fall Time; V

PF(MAX)

to V

PF(MIN)

300

Rise Time; V

PF(MIN)

to V

PF(MAX)

Note 11: If the EOSC bit in the control register is set to logic 1, t

RPU

is equal to 250ms plus the startup time of the crystal oscillator.

Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in write

protection.

Figure 1. Timing Diagram

SCL

START

SDA

STOP

BUF

REPEATED

START

HD:STA

LOW

HD:STA

HD:DAT

SU:DAT

HIGH

SU:STA

SU:STO

Figure 2. Power-Up/Power-Down Timing

OUTPUTS

PF(max)

INPUTS

HIGH-Z

RST

DON'T CARE

VALID

RECOGNIZED

VALID

RPD

PF(min)

RPU

1 2 3 4 5 6 7 8 9 10 11 12

GENERAL DESCRIPTION 1
FEATURES 1
ORDERING INFORMATION 1
PIN CONFIGURATION 1
TYPICAL OPERATING CIRCUIT 1
DC ELECTRICAL CHARACTERISTICS 2
ABSOLUTE MAXIMUM RATINGS 2
CRYSTAL SPECIFICATIONS 3
AC ELECTRICAL CHARACTERISTICS 4
Figure 1. Timing Diagram 5
PIN DESCRIPTIONS 6
OPERATION 7
Figure 4. Block Diagram 7
Clock Accuracy 7
Address Map 7
Table 1. Registers 7
Data Retention Mode 8
Oscillator Control 8
Microprocessor Monitor 8
Trickle Charger 8
2-Wire Serial Data Bus 10
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Rainbow-electronics DS1672 Manuel d'utilisateur Page 5

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