Rainbow-electronics DS2745 Manual de usuario descargar pdf (Pagina 3)

DS2745 Low-Cost I

2

C Battery Monitor

3 of 14

±2

-20°C ≤ T

A

≤ +70°C,

2.5V ≤ V

DD

≤ 5.5V

±3

Input Resistance, VIN R

IN

15

MW

Input Logic High:

SCL, SDA

V

IH

(Note 1) 1.5 V

Input Logic Low:

SCL, SDA

V

IL

(Note 1) 0.6 V

Output Logic Low:

SDA, PIO

V

OL

I

OL

= 4mA (Note 1) 0.4 V

Pulldown Current: SCL,

SDA

I

PD

0.25

mA

Input Capacitance: SCL,

SDA

C

BUS

50 pF

SLEEP Timeout t

SLEEP

(Note 3) 2.2 S

Input Logic High:

PIO

V

IH

(Note 1) V

DD

x 0.7 V

Input Logic Low:

PIO

V

IL

(Note 1) V

DD

x 0.3 V

2-WIRE INTERFACE TIMING SPECIFICATIONS

(V

DD

= 2.5V to 5.5V, T

A

= -20°C to +70°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCL Clock Frequency

f

SCL

(Note 6) 0 400 KHz

Bus Free Time Between a

STOP and START Condition

t

BUF

1.3 µs

Hold Time (Repeated)

START Condition

t

HD:STA

(Note 7) 0.6 µs

Low Period of SCL Clock

t

LOW

1.3 µs

High Period of SCL Clock

t

HIGH

0.6 µs

Setup Time for a Repeated

START Condition

t

SU:STA

0.6 µs

Data Hold Time

t

HD:DAT

(Note 8, 9) 0 0.9 µs

Data Setup Time

t

SU:DAT

(Note 8) 100 ns

Rise Time of Both SDA and

SCL Signals

t

R

20 + 0.1C

B

300 ns

Fall Time of Both SDA and

SCL Signals

t

F

20 + 0.1C

B

300 ns

Setup Time for STOP

Condition

t

SU:STO

0.6 µs

Spike Pulse Widths

Suppressed by Input Filter

t

SP

(Note 10) 0 50 ns

Capacitive Load for Each

Bus

Line

C

B

(Note 11) 400 pF

SCL, SDA Input

Capacitance

C

BIN

60 pF

1 2 3 4 5 6 7 8 ... 13 14

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