参数资料
型号: LM89CIM/NOPB
厂商: National Semiconductor
文件页数: 11/32页
文件大小: 0K
描述: IC TEMP SENSOR DGTL 8-SOIC
标准包装: 95
功能: 温度监控系统(传感器)
传感器类型: 内部和外部
感应温度: 0°C ~ 125°C
精确度: ±3°C(最小值)
拓扑: ADC(三角积分型),比较器,寄存器库
输出类型: 2 线 SMBus?
输出警报:
输出风扇:
电源电压: 3 V ~ 3.6 V
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOICN
包装: 管件
配用: LM89EVAL-ND - BOARD EVALUATION LM89
其它名称: LM89CIM
SNIS128C – AUGUST 2002 – REVISED MARCH 2013
5. Master/slave NoACK
6. Master sends STOP
7. Master attends to conditions that caused the ALERT to be triggered. The STATUS REGISTER is read and
fan started, setpoint limits adjusted, etc.
8. Master resets the ALERT mask (D7 in the Configuration register).
The ARA, 000 1100, is a general call address. No device should ever be assigned this address.
Bit D0 (the ALERT configure bit) in the FILTER and ALERT CONFIGURE REGISTER (xBF) must be set low in
order for the LM89 to respond to the ARA command.
The ALERT output can be disabled by setting the ALER T mask bit, D7, of the Configuration register. The power-
on-default is to have the ALERT mask bit and the ALERT configure bit low.
Remote High Limit
RDTS Measurement
LM89 ALERT pin
ALERT mask set in
response to ARA
from master
Status Register: RTDS High
TIME
Figure 6. ALERT Output as an SMBus ALERT Temperature Response Diagram
T_CRIT_A OUTPUT and T_CRIT LIMIT
T_CRIT_A is activated when any temperature reading is greater than the limit preset in the critical temperature
setpoint register (T_CRIT), as shown in Figure 7 . The Status Register can be read to determine which event
caused the alarm. A bit in the Status Register is set high to indicate which temperature reading exceeded the
T_CRIT setpoint temperature and caused the alarm, see STATUS REGISTER (SR) .
Local and remote temperature diodes are sampled in sequence by the A/D converter. The T_CRIT_A output and
the Status Register flags are updated after every Local and Remote temperature conversion. T_CRT_A follows
the state of the comparison, it is reset when the temperature falls below the setpoint RCS-TH. The Status
Register flags are reset only after the Status Register is read and if a temperature conversion(s) is/are below the
T_CRIT setpoint, as shown in Figure 7 .
Figure 7. T_CRIT_A Temperature Response Diagram
Copyright ? 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM89
11
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