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参数资料
| 型号： | LM89EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 12/32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
POWER-ON-DEFAULT STATES
LM89 always powers up to these known default states. The LM89 remains in these states until after the first
conversion.
1. Command Register set to 00h
2. Local Temperature set to 0°C
3. Remote Diode Temperature set to 0°C until the end of the first conversion.
4. Status Register set to 00h.
5. Configuration register set to 00h; ALERT enabled, Remote T_CRIT alarm enabled and Local T_CRIT alarm
enabled
6. 85°C Local T_CRIT temperature setpoint
7. 110°C Remote T_CRIT temperature setpoint
8. 70°C Local and Remote HIGH temperature setpoints
9. 0°C Local and Remote LOW temperature setpoints
10. Filter and Alert Configure Register set to 00h; filter disabled, ALERT output set as an SMBus ALERT
11. Conversion Rate Register set to 8h; conversion rate set to 16 conv./sec.
SMBus INTERFACE
The LM89 operates as a slave on the SMBus, so the SMBCLK line is an input and the SMBData line is bi-
directional. The LM89 never drives the SMBCLK line and it does not support clock stretching. According to
SMBus specifications, the LM89 has a 7-bit slave address. All bits A6 through A0 are internally programmed and
can not be changed by software or hardware. The LM89 and LM89-1 versions have the following SMBus slave
addresses:
Version
LM89
LM89-1
A6
1
1
A5
0
0
A4
0
0
A3
1
1
A2
1
1
A1
0
0
A0
0
1
TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and Remote Temperature registers; the setpoint registers
(T_CRIT, LOW, HIGH) are read/write.
Remote temperature data is represented by an 11-bit, two's complement word with an LSB (Least Significant Bit)
equal to 0.125°C. The data format is a left justified 16-bit word available in two 8-bit registers:
Temperature
Digital Output
Binary
Hex
+125°C
+25°C
+1°C
+0.125°C
0°C
? 0.125°C
? 1°C
? 25°C
? 55°C
0111 1101 0000 0000
0001 1001 0000 0000
0000 0001 0000 0000
0000 0000 0010 0000
0000 0000 0000 0000
1111 1111 1110 0000
1111 1111 0000 0000
1110 0111 0000 0000
1100 1001 0000 0000
7D00h
1900h
0100h
0020h
0000h
FFE0h
FF00h
E700h
C900h
Local Temperature data is represented by an 8-bit, two's complement byte with an LSB (Least Significant Bit)
equal to 1°C:
12
Product Folder Links: LM89
Copyright ? 2002–2013, Texas Instruments Incorporated
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