Rainbow-electronics DS75LV Manual de usuario descargar pdf (Pagina 3)

DS75LV: Digital Thermometer and Thermostat

3 of 13

Falling SCL

Low Period of SCL t

LOW

(Note 5) 1.3

High Period of SCL t

HIGH

(Note 5) 0.6

Repeated START Condition

Setup Time to Rising SCL

SU:STA

(Note 5) 600 ns

Data-Out Hold Time from

Falling SCL

HD:DAT

(Notes 5, 8)

0.9

Data-In Setup Time to

Rising SCL

SU:DAT

(Note 5)

100

Rise Time of SDA and SCL

(Receive)

(Notes 5, 7) 20 + 0.1C

300

Fall Time of SDA and SCL

(Receive)

(Notes 5, 7) 20 +

0.1C

300 ns

Spike Suppression Filter

Time (Deglitch Filter)

0 50 ns

STOP Setup Time to Rising

SCL

SU:STO

(Note 5) 600 ns

Capacitive Load for Each

Bus Line

400 pF

Input Capacitance C

5 pF

Serial Interface Reset Time t

TIMEOUT

SDA time low (Note 9) 75 325 ms

Note 1:

All voltages are referenced to ground.

Note 2:

Internal heating caused by O.S. loading will cause the DS75LV to read approximately 0.5°C higher if O.S. is sinking the max rated

current.

Note 3:

specified with O.S. pin open.

Note 4:

specified with V

at 3.0V and SDA, SCL = 3.0V, 0°C to 70°C.

Note 5:

See Timing Diagram in Figure 2. All timing is referenced to 0.9 x V

and 0.1 x V

Note 6:

After this period, the first clock pulse is generated.

Note 7:

For example, if C

= 300pF, then t

[min] = t

[min] = 50ns.

Note 8:

The DS75LV provides an internal hold time of at least 75ns on the SDA signal to bridge the undefined region of SCL's falling edge.

Note 9:

This time-out applies only when the DS75LV is holding SDA low. Other devices can hold SDA low indefinitely and the DS75LV will

not reset.

Note

10:

The DS75LV has a maximum operating voltage of 3.7V. Contact Dallas Semiconductor for information on the availability of a 3.7V to

5.5V version of the DS75LV.

Table 1. Detailed Pin Description

PIN SYMBOL PIN DESCRIPTION

1 SDA

Data Input/Output. For 2-wire serial communication port. Open-drain.

2 SCL

Clock Input. 2-wire serial communication port.

3 O.S.

Thermostat Output. Open-drain.

4 GND

Ground

5 A

Address Input

6 A

Address Input

7 A

Address Input

8 V

Supply Voltage. +1.7V to +3.7V supply pin.

1 2 3 4 5 6 7 8 ... 12 13

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Rainbow-electronics DS75LV Manual de usuario Pagina 3

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