lm95221cimm-eng National Semiconductor Corporation, lm95221cimm-eng Datasheet
lm95221cimm-eng
Related parts for lm95221cimm-eng
lm95221cimm-eng Summary of contents
Page 1
... LSb — 10-bits plus sign or 11-bits programmable resolution Simplified Block Diagram Pentium ™ trademark of Intel Corporation. © 2004 National Semiconductor Corporation — 11-bits resolves temperatures above 127 ˚C n Local temperature readings: — 0.25 ˚C — 9-bits plus sign n Status register support ...
Page 2
... Connection Diagram Ordering Information Package Part Number Marking LM95221CIMM LM95221CIMM LM95221CIMMX LM95221CIMM Pin Descriptions Label Pin # D1+ 1 D1− 2 D2+ 3 D2− 4 GND www.national.com MSOP-8 20094302 TOP VIEW NS Package Number MUA08A (MSOP-8) 1000 Units on Tape MUA08A (MSOP-8) 3500 Units on Tape ...
Page 3
Pin Descriptions (Continued) Label Pin # SMBDAT 7 SMBCLK 8 Typical Application Function SMBus Bi-Directional Data From and to Controller; may require an external Line, Open-Drain Output pull-up resistor SMBus Clock Input From Controller; may require an external pull-up resistor ...
Page 4
... Operating Temperature Range −65˚C to +150˚C Electrical Characteristics Temperature Range LM95221CIMM 215˚C Supply Voltage Range (V =+3.0Vdc to 3.6Vdc. Boldface limits apply for T DD =+25˚C, unless otherwise noted the junction temperature of the LM95221 ...
Page 5
Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for V its apply for MIN MAX Symbol Parameter SMBDAT, SMBCLK INPUTS V Logical “1” Input Voltage IN(1) V ...
Page 6
... LM95221 and the thermal resistance. See (Note 5) for the thermal resistance to be used in the self-heating calculation. Note 9: The accuracy of the LM95221CIMM is guaranteed when using the thermal diode with a non-ideality of 1.008 and series R= 2.7Ω. When using an MMBT3904 type transistor as the thermal diode the error band will be offset by -3.25˚C Note 10: Quiescent current will not increase substantially with an SMBus ...
Page 7
Typical Performance Characteristics Thermal Diode Capacitor or PCB Leakage Current Effect Remote Diode Temperature Reading Conversion Rate Effect on Average Power Supply Current 1.0 Functional Description The LM95221 is a digital sensor that can sense the tempera- ture of 3 ...
Page 8
Functional Description 7. Status Register: busy, diode fault 8. Configuration Register: resolution control, conversion rate control, standby control 9. 1-shot Register 10. Manufacturer ID 11. Revision ID 1.1 CONVERSION SEQUENCE The LM95221 takes approximately convert the ...
Page 9
Functional Description Temperature Digital Output Binary −0.25˚C 1111 1111 1100 0000 −1˚C 1111 1111 0000 0000 −25˚C 1110 0111 0000 0000 −55˚C 1100 1001 0000 0000 1.5 SMBDAT OPEN-DRAIN OUTPUT The SMBDAT output is an open-drain output and does ...
Page 10
Functional Description (a) Serial Bus Write to the internal Command Register followed by a the Data Byte (b) Serial Bus Write to the Internal Command Register (c) Serial Bus Read from a Register with the Internal Command Register preset ...
Page 11
Functional Description 1.8 SERIAL INTERFACE RESET In the event that the SMBus Master is RESET while the LM95221 is transmitting on the SMBDAT line, the LM95221 must be returned to a known state in the communication protocol. This may ...
Page 12
LM95221 Registers 2.1 STATUS REGISTER (Read Only Address 02h Busy 0 Bits Name 7 Busy 6-2 Reserved 1 Remote diode 2 missing (RD2M) 0 Remote diode 1 missing (RD1M) 2.2 CONFIGURATION REGISTER (Read Address 03h /Write Address ...
Page 13
LM95221 Registers 2.3 LOCAL and REMOTE MSB and LSB TEMPERATURE REGISTERS (Read Only Address 10h) 9-bit plus sign format: BIT Value SIGN Temperature Data: LSb = 1˚C. (Read Only Address 20h) 9-bit plus sign format: BIT Value Temperature Data: ...
Page 14
Applications Hints The LM95221 can be applied easily in the same way as other integrated-circuit temperature sensors, and its remote diode sensing capability allows used in new ways as well. It can be soldered to a ...
Page 15
Applications Hints 3.1.2 Compensating for Diode Non-Ideality In order to compensate for the errors introduced by non- ideality, the temperature sensor is calibrated for a particular processor. National Semiconductor temperature sensors are always calibrated to the typical non-ideality of ...
Page 16
... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted JEDEC Registration Number MO-187 Order Number LM95221CIMM or LM95221CIMMX NS Package Number MUA08A 2. A critical component is any component of a life ...