Electronic Components Datasheet Search |
|
LM75BIMMX-5+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
|
LM75BIMMX-5+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page Temperature Data Format Temperature data is stored in the Temperature, TOS Set Point, and THYST Set Point registers. The temperature data format is 9 bits, two’s complement, and the register is read out in 2 bytes: an upper byte and a lower byte. Bits D15–D7 contain the temperature data, with the LSB representing 0.5°C and the MSB representing the sign bit (see Table 3). The MSB is transmitted first. The last 7 bits of the lower byte, bits D6–D0, are don’t cares. Shutdown Set bit D0 in the Configuration register to 1 to place the LM75 in shutdown mode and reduce supply current to 4µA. In interrupt mode, entering shutdown resets the OS output. While in shutdown, the I2C remains active and TOS and THYST limit registers along with the Configuration register remain accessible to the master. Fault Queue The fault queue prevents OS false tripping in noisy environments. The number of faults set in the queue (up to 6) must occur to trip the OS output. Comparator/Interrupt Mode The events that trigger OS are identical between com- parator and interrupt modes. In comparator mode, OS is asserted when the temperature rises above the TOS value. OS is deasserted when the temperature drops below the THYST value. In interrupt mode, OS is assert- ed when the temperature rises above the TOS value or falls below the THYST value. OS is deasserted only after performing a read operation. OS Output The OS output is an open-drain output without an inter- nal pullup. Connect a pullup resistor from OS to +VS. Using larger resistance values reduces any tempera- ture errors due to self heating from current entering OS. OS Polarity The OS polarity can be programmed for active-low or active-high operation. In active-low operation, OS goes low when triggered by a temperature event. Internal Registers The LM75’s Pointer register selects between four data registers (see Figure 6). At power-up, the pointer is set to read the Temperature register at address 0x00. The Pointer register latches the last location to which it was set. All registers are read and write, except the Temperature register, which is read only. Write to the Configuration register by writing an address byte, a data pointer byte, and a data byte. If 2 data bytes are written, the second data byte overrides the first. The TOS and THYST registers require 1 address byte, 1 pointer byte, and 2 data bytes. If only 1 data byte is written, it is saved in bits D15–D8 of the respec- tive register. If more than 2 data bytes are written, only the first 2 bytes are recognized while the remaining bytes are ignored. Read from the LM75 in one of two ways. If the location latched in the Pointer register is set from the previous read, the new read consists of an address byte, fol- lowed by retrieving the corresponding number of data bytes. If the Pointer register needs to be set to a new address, perform a read operation by writing an address byte, pointer byte, repeat start, and another address byte. An inadvertent 8-bit read from a 16-bit register, with the D7 bit low, can cause the device to stop in a state where the SDA line is held low. Ordinarily, this would prevent any further bus communication until the master sends nine additional clock cycles or SDA goes high. At that time, a stop condition resets the device. If the additional clock cycles are not generated by the mas- ter, the LM75 bus resets and unlocks after the bus time- out period has elapsed. Digital Temperature Sensor and Thermal Watchdog with 2-Wire Interface _______________________________________________________________________________________ 9 SMBus is a trademark of Intel Corp. Figure 6. Block Diagram LM75 +VS A2/RESET A1 A0 SDA SCL OS SMBus™ INTERFACE BLOCK POINTER REGISTER (SELECTS REGISTER FOR COMMUNICATION) DATA ADDRESS REGISTER SELECT GND TEMPERATURE (READ ONLY) POINTER = 0000 0000 TOS SET POINT (READ/WRITE) POINTER = 0000 0011 THYST SET POINT (READ/WRITE) POINTER = 0000 0010 CONFIGURATION (READ/WRITE) POINTER = 0000 0001 |
Similar Part No. - LM75BIMMX-5+ |
|
Similar Description - LM75BIMMX-5+ |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |