Electronic Components Datasheet Search |
|
LM77CIMX-3 Datasheet(PDF) 10 Page - Texas Instruments |
|
LM77CIMX-3 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page LM77 SNIS103F – JUNE 1999 – REVISED MARCH 2013 www.ti.com SHUTDOWN MODE Shutdown mode is enabled by setting the shutdown bit in the Configuration register via the Serial Bus. Shutdown mode reduces power supply current to 5 μA typical. T_CRIT_A is reset if previously set. Since conversions are stoped during shutdown, T_CRIT_A and INT will not be operational. The Serial Bus interface remains active. Activity on the clock and data lines of the Serial Bus may slightly increase shutdown mode quiescent current. Registers can be read from and written to in shutdown mode. The LM77 takes miliseconds to respond to the shutdown command. INT AND T_CRIT_A OUTPUT The INT and T_CRIT_A outputs are open-drain outputs and do not have internal pull-ups. A "high" level will not be observed on these pins until pull-up current is provided from some external source, typically a pull-up resistor. Choice of resistor value depends on many system factors but, in general, the pull-up resistor should be as large as possible. This will minimize any errors due to internal heating of the LM77. The maximum allowable resistance of the pull up resistor is 90K Ohms based on the Logic “1” Output Leakage Current and a 2 volt high output level. FAULT QUEUE A fault queue of up to 4 faults is provided to prevent false tripping when the LM77 is used in noisy environments. The 4 faults must occur consecutively to set flags as well as INT and T_CRIT_A outputs. The fault queue is enabled by setting bit 4 of the Configuration Register high (see Table 3). INTERNAL REGISTER STRUCTURE Figure 8. The data registers in the LM77 are selected by the Pointer register. At power-up the Pointer is set to “00”; the location for the Temperature Register. The Pointer register latches the last location it was set to. In Comparator Interrupt Mode, a read from the LM77 resets the INT output. Placing the device in Shutdown mode resets the INT and T_CRIT_A outputs. All registers are read and write, except the Temperature register which is read only. A write to the LM77 will always include the address byte and the Pointer byte. A write to the Configuration register requires one data byte, while the TLOW, THIGH, and T_CRIT registers require two data bytes. 10 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM77 |
Similar Part No. - LM77CIMX-3 |
|
Similar Description - LM77CIMX-3 |
|
|
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 |