LM89-1EVAL National Semiconductor, LM89-1EVAL Datasheet
LM89-1EVAL
Specifications of LM89-1EVAL
Related parts for LM89-1EVAL
LM89-1EVAL Summary of contents
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... LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A occurs when any temperature exceeds the T_CRIT programmed limit. The LM89 is pin and register compatible with the LM86, LM90, Analog Devices ADM1032 and Maxim MAX6657/8. Features n Accurately senses die temperature of remote ICs or ...
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... A 2.2 nF diode bypass capacitor is required to filter high frequency noise. Place the 2.2 nF capacitor between and as close as possible to the LM89’s D+ and D− pins. Make sure the traces to the 2.2 nF capacitor are matched. Diode Return Current Sink To Diode Cathode ...
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Typical Application 3 20041503 www.national.com ...
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... Machine Model ± Operating Ratings 30 mA (Notes 1, 5) Operating Temperature Range 10 mA Electrical Characteristics −65˚C to Temperature Range +150˚C LM89 Supply Voltage Range (V =+3.0Vdc to 3.6Vdc. Boldface limits apply for T DD =+25˚C, unless otherwise noted. J Conditions T = +25˚C to +125˚C, (Note +30˚ +80˚ ...
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... Boldface limits apply for +25˚C, unless otherwise noted. The switching characteristics of the LM89 fully meet or exceed the published specifi cations of the SMBus version 2.0. The following parameters are the timing relationships between SMBCLK and SMBData sig- nals related to the LM89 ...
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... I Parasitic components and or ESD protection circuitry are shown in the figure below for the LM89’s pins. The nominal breakdown voltage 6.5 V. Care should be taken not to forward bias the parasitic diode, D1, present on pins: D+, D−. Doing so by more than 50 mV may corrupt a temperature measurements. ...
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... ALERT mask bit in the Configuration register must be cleared to trigger an ALERT in all modes. 1.2.1 ALERT Output as a Temperature Comparator When the LM89 is implemented in a system in which it is not serviced by an interrupt routine, the ALERT output could be used as a temperature comparator. Under this method of use, once the condition that triggered the ALERT to go low is no longer present, the ALERT is de-asserted (Figure 3) ...
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... Under this method of operation, during a read of the STATUS REGISTER the LM89 will set the ALERT mask bit (D7 of the Configuration register) if any bit in the STATUS REGISTER is set, with the exception of Busy (D7) and OPEN (D2) ...
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... The LM89 never drives the SMBCLK line and it does not support clock stretching. According to SMBus specifications, the LM89 has a 7-bit slave address. All bits A6 through A0 are internally programmed and can not be changed by software or hardware. The LM89 and LM89-1 versions have the following SMBus slave addresses: ...
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... Register. At power-up the Command Register is set to “00”, the location for the Read Local Temperature Register. Hex The Command Register latches the last location it was set 7Dh to. Each data register in the LM89 falls into one of four types of user accessibility: 19h 1. Read only 01h 2 ...
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... Serial Bus Read from a Register with the Internal Command Register preset to desired value. 1.10 SERIAL INTERFACE RESET In the event that the SMBus Master is RESET while the LM89 is transmitting on the SMBData line, the LM89 must be returned to a known state in the communication protocol. This may be done in one of two ways: 1 ...
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Functional Description FIGURE REGISTER at BFh. The filter can be set according to the following table Step Response FIGURE 9. Digital Filter Response in a Pentium 4 processor ...
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... Functional Description 1.12 FAULT QUEUE In order to suppress erroneous ALERT or T_CRIT triggering the LM89 incorporates a Fault Queue. The Fault Queue acts to insure a remote temperature measurement is genuinely beyond a HIGH, LOW or T_CRIT setpoint by not triggering until three consecutive out of limit measurements have been made, see Figure 10 ...
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... D7: ALERT mask: When set to “1” ALERT interrupts are masked. www.national.com Power-On-Default State < > < > D7:D0 binary D7:D0 decimal 0000 0000 0 0000 0000 0 0000 0000 0 0110 1110 110 0101 0101 85 0000 1010 10 0000 0000 0 0000 0001 1 LM89 0011 0001 49 LM89-1 0011 0100 SIGN 0.5 0.25 0.125 LLOW RHIGH RLOW D5 ...
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... LM89 Registers (Continued) D6: RUN/STOP: When set to “1” SHUTDOWN is enabled. D5: is not defined and defaults to “0”. D4: Remote T_CRIT mask: When set to “1” a diode temperature reading that exceeds T_CRIT setpoint will not activate the T_CRIT_A pin. D3: is not defined and defaults to “0”. ...
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... Address FEh) The default value is 01h. 2.13 DIE REVISION CODE REGISTER (Read Address FFh) The LM89 version has a default value of 31h or 49 decimal. The LM89-1 version has a default value of 34h or 52 decimal. This register will increment by 1 every time there is a revision to the die by National Semiconductor. ...
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... National Semiconductor temperature sensors are always calibrated to the typical non-ideality of a given pro- cessor type. The LM89 is calibrated for the non-ideality of a 0.13 micron, Mobile Pentium 4, 1.0021. When a temperature sensor calibrated for a particular processor type is used with ...
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... necessary to cross high speed digital traces, the diode traces and the high speed digital traces should 20041517 cross degree angle. 8. The ideal place to connect the LM89’s GND pin is as close as possible to the Processors GND associated with the sense diode. 9. Leakage current between D+ and GND should be kept to a minimum. One nano-ampere of leakage can cause as much as 1˚ ...
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... Wide) Molded Narrow Small-Outline Package (SOIC), 8-Lead Molded Mini-Small-Outline Package (MSOP), JEDEC Registration Number MS-012 Order Number LM89CIM or LM89CIMX NS Package Number M08A JEDEC Registration Number MO-187 Order Number LM89CIMM or LM89CIMMX NS Package Number MUA08A 19 www.national.com ...
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... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...