LM75 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

LM75

2-Wire Serial Temperature Sensor and Monitor

ON Semiconductor 

LM75

1

91

91

9

1 0 0 1 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Start

by

Master

Address Byte

Ack

by Most Significant Data Byte

LM75

Ack

by Least Significant Data Byte

Master

Stop

No Ack Cond

by

by

Master Master

(a) Typical 2–Byte Read From Preset Pointer Location Such as Temp, TOS, THYST

1

91

9

.....

1 0 0 1 A2 A1 A0 R/W

0 0 0 0 0 0 D1 D0

.....

Start

by

Master

Address Byte

Ack

by

LM75

Pointer Byte

Ack

by

LM75

1

91

91

9

1 0 0 1 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Repeat

Start

by

Master

Address Byte

Ack

by

LM75

Most Significant Data Byte

Ack

by

Master

Least Significant Data Byte

No Ack

by

Master

Stop

Cond

by

Master

(b) Typical Pointer Set Followed by Immediate Read for 2–Byte Register Such as Temp, TOS, THYST

1

91

9

1

Start

by

Master

0 0 1 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0

Address Byte

Ack

by

LM75

Data Byte

No Ack

by

Master

Stop

Cond

by

Master

(c) Typical 1–Byte Read From Configuration Register With Preset Pointer

1

91

9

1

91

9

1 0 0 1 A2 A1 A0 R/W 0 0 0 0 0 0 0 D0

1

Start

by

Master

Address Byte

Ack

by

LM75

Pointer Byte

Ack Repeat

by Start

LM75 by

Master

(d) Typical Pointer Set Followed by Immediate Read from Configuration Register

1

91

91

0 0 1 A2 A1 A0 R/W D7 D6 D5 D4 D3 D2 D1 D0

Address Byte

Ack

by

LM75

Data Byte

Stop

No Ack Cond

by by

Master Master

9

1 0 0 1 A2 A1 A0 R/W 0 0 0 0 0 0 D1 D0

0 0 0 D4 D3 D2 D1 D0

Start

by

Master

Address Byte

Ack

by

LM75

Pointer Byte

Ack

by

LM75

Configuration Byte

Stop

Ack Cond

by by

LM75 Master

(e) Configuration Register Write

1

91

91

91

9

1 0 0 1 A2 A1 A0 R/W

0 0 0 0 0 0 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Start

by

Master

Address Byte

Ack

by

LM75

Pointer Byte

Ack

Ack

by Most Significant Data Byte by Least Significant Data Byte

LM75

LM75

Stop

Ack Cond

by by

LM75 Master

(f) TOS and THYST Write

Figure 2. Serial Port Operation

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6

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