công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
LM73 bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI) |
|
|
LM73 bảng dữ liệu(HTML) 8 Page - National Semiconductor (TI) |
8 / 18 page 1.0 Functional Description The LM73 is a digital temperature sensor that senses the temperature of its die using a sigma-delta analog-to-digital converter and stores the temperature in the Temperature Register. The LM73’s 2-wire serial interface is compatible with SMBus 2.0 and I 2C. Please see the SMBus 2.0 speci- fication for a detailed description of the differences between the I 2C bus and SMBus. The temperature resolution is programmable, allowing the host system to select the optimal configuration between sensitivity and conversion time. The LM73 can be placed in shutdown to minimize power consumption when tempera- ture data is not required. While in shutdown, a 1-shot con- version mode allows system control of the conversion rate for ultimate flexibility. The LM73 features the following registers. See Section 2.0 for a complete list of the pointer address, content, and reset state of each register. 1. Pointer Register 2. Temperature Register 3. Configuration Register 4. T HIGH Register 5. T LOW Register 6. Control/Status Register 7. Identification Register 1.1 POWER-ON RESET The power-on reset (POR) state is the point at which the supply voltage rises above the power-on reset threshold (specified in the electrical specifications table), generating an internal reset. Each of the registers contains a defined value upon POR and this data remains there until any of the following occurs: 1. The first temperature conversion is completed, causing the Temperature Register and various status bits to be updated internally, depending on the value of the mea- sured temperature 2. The master writes different data to any R/W bits 3. The LM73 is powered down 1.2 ONE-SHOT CONVERSION The LM73 features a one-shot conversion bit, which is used to initiate a single conversion and comparison cycle when the LM73 is in shutdown mode. While the LM73 is in shut- down mode, writing a "1" to the One-Shot bit in the Configu- ration Register will cause the LM73 to perform a single temperature conversion and update the Temperature Regis- ter and the affected status bits. Operating the LM73 in this one-shot mode allows for extremely low average-power con- sumption, making it ideal for low-power applications. When the One-Shot bit is set, the LM73 initiates a tempera- ture conversion. After this initiation, but before the comple- tion of the conversion and resultant register updates, the LM73 is in a "one-shot" state. During this state, the Data Available (DAV) flag in the Control/Status register is "0" and the Temperature Register contains the value 8000h (-256˚C). All other registers contain the data that was present before initiating the one-shot conversion. After the temperature measurement is complete, the DAV flag will be set to "1" and the temperature register will contain the result- ant measured temperature. 1.3 TEMPERATURE DATA FORMAT The resolution of the temperature data and the size of the data word are user-selectable through bits RES1 and RES0 in the Control/Status Register. By default, the LM73 tem- perature stores the measured temperature in an 11-bit (10 bits plus sign) word with one least significant bit (LSB) equal to 0.25˚C. The maximum word size is 14 bits (13-bits plus sign) with a resolution of 0.03125 ˚C/LSB. CONTROL BIT DATA FORMAT RES1 RES0 WORD SIZE RESOLUTION 0 0 11 bits 0.25 ˚C/LSB 0 1 12 bits 0.125 ˚C/LSB 1 0 13 bits 0.0625 ˚C/LSB 1 1 14 bits 0.03125 ˚C/LSB The temperature data is reported in 2’s complement format. The word is stored in the 16-bit Temperature Register and is left justified in this register. Unused temperature-data bits are always reported as "0". 11-bit (10-bit plus sign) Temperature Digital Output Binary Hex +150˚C 0100 1011 0000 0000 4B00h +25˚C 0000 1100 1000 0000 0C80h +1˚C 0000 0000 1000 0000 0080h +0.25˚C 0000 0000 0010 0000 0020h 0˚C 0000 0000 0000 0000 0000h −0.25˚C 1111 1111 1110 0000 FFE0h −1˚C 1111 1111 1000 0000 FF80h −25˚C 1111 0011 1000 0000 F380h −40˚C 1110 1100 0000 0000 EC00h 12-bit (11-bit plus sign) Temperature Digital Output Binary Hex +150˚C 0100 1011 0000 0000 4B00h +25˚C 0000 1100 1000 0000 0C80h +1˚C 0000 0000 1000 0000 0080h +0.125˚C 0000 0000 0001 0000 0010h 0˚C 0000 0000 0000 0000 0000h −0.125˚C 1111 1111 1111 0000 FFF0h −1˚C 1111 1111 1000 0000 FF80h −25˚C 1111 0011 1000 0000 F380h −40˚C 1110 1100 0000 0000 EC00h www.national.com 8 |
Số phần tương tự - LM73 |
|
Mô tả tương tự - LM73 |
|
|
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 |