Electronic Components Datasheet Search |
|
LM75BGD Datasheet(PDF) 6 Page - NXP Semiconductors |
|
LM75BGD Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 29 page LM75B_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 9 December 2008 6 of 29 NXP Semiconductors LM75B Digital temperature sensor and thermal watchdog 7.2 I2C-bus serial interface The LM75B can be connected to a compatible 2-wire serial interface I2C-bus as a slave device under the control of a controller or master device, using two device terminals, SCL and SDA. The controller must provide the SCL clock signal and write/read data to/from the device through the SDA terminal. Notice that if the I2C-bus common pull-up resistors have not been installed as required for I2C-bus, then an external pull-up resistor, about 10 k Ω, is needed for each of these two terminals. The bus communication protocols are described in Section 7.10. 7.2.1 Bus fault time-out If the SDA line is held LOW for longer than tto (75 ms minimum / 13.3 Hz; guaranteed at 50 ms minimum / 20 Hz), the LM75B will reset to the idle state (SDA released) and wait for a new START condition. This ensures that the LM75B will never hang up the bus should there be conflict in the transmission sequence. 7.3 Slave address The LM75B slave address on the I2C-bus is partially defined by the logic applied to the device address pins A2, A1 and A0. Each of them is typically connected either to GND for logic 0, or to VCC for logic 1. These pins represent the three LSB bits of the device 7-bit address. The other four MSB bits of the address data are preset to ‘1001’ by hard wiring inside the LM75B. Table 3 shows the device’s complete address and indicates that up to 8 devices can be connected to the same bus without address conflict. Because the input pins, SCL, SDA and A2 to A0, are not internally biased, it is important that they should not be left floating in any application. 7.4 Register list The LM75B contains four data registers beside the pointer register as listed in Table 4. The pointer value, read/write capability and default content at power-up of the registers are also shown in Table 4. Table 3. Address table 1 = HIGH; 0 = LOW. MSB LSB 1001A2 A1 A0 Table 4. Register table Register name Pointer value R/W POR state Description Conf 01h R/W 00h Configuration register: contains a single 8-bit data byte; to set the device operating condition; default = 0. Temp 00h read only n/a Temperature register: contains two 8-bit data bytes; to store the measured Temp data. Tos 03h R/W 5000h Overtemperature shutdown threshold register: contains two 8-bit data bytes; to store the overtemperature shutdown Tth(ots) limit; default = 80 °C. Thyst 02h R/W 4B00h Hysteresis register: contains two 8-bit data bytes; to store the hysteresis Thys limit; default = 75 °C. |
Similar Part No. - LM75BGD |
|
Similar Description - LM75BGD |
|
|
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 |