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| 型号： | LM89EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM89 |
| 标准包装： | 1 |
| 传感器类型： | 温度 |
| 传感范围： | 0°C ~ 125°C |
| 接口： | SMBus（2 线/I²C） |
| 灵敏度： | ±1°C |
| 电源电压： | 3 V ~ 3.6 V |
| 嵌入式： | 否 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | LM89 |
| 相关产品： | LM89CIM-ND - IC TEMP SENSOR DGTL 8-SOIC LM89CIMX-ND - IC TEMP SENSOR DGTL 8-SOIC LM89CIMM-ND - IC TEMP SENSOR DGTL 8-MSOP LM89CIMMX-ND - IC TEMP SENSOR DGTL 8-MSOP |
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SNIS128C – AUGUST 2002 – REVISED MARCH 2013
The data byte has the most significant bit first. At the end of a read, the LM89 can accept either acknowledge or
No Acknowledge from the Master (No Acknowledge is typically used as a signal for the slave that the Master has
read its last byte). It takes the LM89 31.25ms to measure the temperature of the remote diode and internal diode.
When retrieving all 10 bits from a previous remote diode temperature measurement, the master must insure that
all 10 bits are from the same temperature conversion. This may be achieved by using one-shot mode or by
setting the conversion rate and monitoring the busy bit such that no conversion occurs in between reading the
MSB and LSB of the last temperature conversion.
SMBus Timing Diagrams
Figure 8. LM89 Timing Diagram
(a) Serial Bus Write to the internal Command Register followed by a the Data Byte
Figure 9. LM89 Timing Diagram
(b) Serial Bus Write to the Internal Command Register
1
9
1
9
SMBCLK
SMBDat
a
A6
A5
A4
A3
A2
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
Start
by
Master
Address byte.
Frame 1
Serial Bus Address Byte
Ack
by
LM89
Frame 2
Data Byte from the LM89
No Ack Stop
by by
Master Master
Figure 10. LM89 Timing Diagram
(c) Serial Bus Read from a Register with the Internal Command Register preset to desired value
14
Product Folder Links: LM89
Copyright ? 2002–2013, Texas Instruments Incorporated
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