công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
LM95245 bảng dữ liệu(PDF) 9 Page - Texas Instruments |
|
LM95245 bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 37 page LM95245 www.ti.com SNIS148G – OCTOBER 2007 – REVISED MARCH 2013 FUNCTIONAL DESCRIPTION The LM95245 is a temperature sensor that measures Local and Remote temperature zones. The LM95245 uses a ΔVbe temperature sensing method. A differential voltage, representing temperature, is digitized using a Sigma- Delta analog to digital converter. TruTherm BJT (Transistor) Beta Compensation Technology allows the LM95245 to accurately sense the temperature of a thermal diode found on die fabricated using a sub-micron process. For more information on TruTherm Technology see Applications Hints . The LM95245 is compatible with the serial SMBus version 2.0 two-wire serial interface. The LM95245 has OS and TCRIT open-drain digital outputs that indicate the state of the local and remote temperature readings when compared to user-programmable limits. If enabled, the local temperature is compared to the user-programmable Local Shared OS and TCRIT Limit Register (Default Value = 85°C). The comparison result can trigger the T_CRIT pin and/or the OS pin depending on the settings of the Local TCRIT Mask and OS Mask bits found in Configuration Register 1. The comparison result can also be read back from Status Register 1. If enabled, the remote temperature is compared to the user-programmable Remote TCRIT Limit Register (Default Value = 110°C), and the Remote OS Limit Register (Default Value = 85°C) values. The comparison result can trigger the T_CRIT pin and/or the OS pin depending on the settings of Configuration Register 1. The following table describes the default temperature settings for each measured temperature that triggers T_CRIT and/or OS pins: Output Pin Remote, °C Local, °C T_CRIT 110 85 OS 85 85 The following table describes the limit register mapping to the T_CRIT and/or OS pins: Output Pin Remote Local T_CRIT Remote TCRIT Limit Local Shared OS/TCRIT Limit OS Remote OS Limit Local Shared OS/TCRIT Limit The T_CRIT and OS outputs are open-drain, active low. The remote temperature readings support a programmable digital filter. Based on the settings in Configuration Register 2 a digital filter can be turned on to improve the noise performance of the remote temperature as well as to increase the resolution of the temperature reading. If the filter is enabled the filtered readings are used for TCRIT and OS comparisons. The LM95245 may be placed in low power consumption (Standby) mode by setting the STOP/RUN bit found in Configuration Register 1. In the Standby mode, the LM95245’s SMBus interface remains active while all circuitry not required is turned off. In the Standby mode the host can trigger one round of conversions by writing to the One-Shot Register. The value written into this register is not kept. Local and Remote temperatures will be converted once and the T_CRIT and OS pins will reflect the comparison results based on this set of conversions results. All the temperature readings are in 16-bit left-justified word format. The 10-bit plus sign local temperature reading is contained in two 8-bit registers: Local Temp MSB and Local Temp LSB Registers. The remote temperature supports both a 13-bit unsigned and a 12-bit plus sign format. These readings are available in their corresponding registers as described in Table 8. The lower 2-bits of the remote temperature reading will contain temperature information only if the digital filter is enabled. If the digital filter is disabled, these two bits will read back 0. The signed and unsigned remote temperature readings are available simultaneously in separate registers, therefore allowing both negative temperatures and temperatures 128°C and above to be measured. All Limit Registers support unsigned temperature format with 1°C LSb resolution. The Local Shared TCRIT and OS Limit Register is 7 bits for limits between 0°C and 127°C. The Remote Temperature TCRIT and OS Limit Registers are 8 bits each for limits between 0°C and 255°C. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM95245 |
Số phần tương tự - LM95245_15 |
|
Mô tả tương tự - LM95245_15 |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |