General description

lm86 is a 11 -digit temperature sensor with a second -line system management bus (SMBUS) serial interface. LM86 can also accurately measure its temperature as an external device (such as a processor) temperature thermal diode or diode connection transistor, such as 2N3904. Any ASIC temperature can be determined accurately using LM86, as long as a dedicated diode (semiconductor knot) is available on the target chip. The accuracy of this LM86 remote sensor is ± 0.75 degrees Celsius, and the 1.008 typical non -ideal factors of the mobile pen were adjusted at the factory #8482; III thermal diode. LM86 has a offset allowing the register that measures other diode to be continuously managed. Latest data new data processor obtained by the hardware monitoring team@nsc.com website. When any temperature exceeds the pre -set window set by High, the alarm output activation low temperature limit record may exceed the T_crit temperature limit. When any temperature exceeds the T_crit programming limit. LM86 is compatible with the simulation device ADM1032 and Maxim MAX6657 /8.

Features

Accurately sensing remote integrated circuit or diode knot

offset register allows sensing various thermal diode accurate

Local temperature transmission of the vehicle Feeling

10 -bit additional remote diode temperature data format, 0.125 degrees Celsius resolution

t_crit_a helps the output of the system shutdown

Alarm output support SMBUS 2.0 protocol

SMBUS 2.0 compatible interface, support timeout

8 -needle MSOP and SOIC packaging

Main specifications

Power supply voltage 3.0V to 3.6V

Power supply Current 0.8mA (typical value)

Local temperature accuracy (including quantitative errors) TA 25 degrees Celsius to 125 degrees Celsius ± 3.0 degrees Celsius (maximum value)

The temperature accuracy of the remote diode (including quantitative errors)

TA 30 degrees Celsius, TD 80 degrees Celsius ± 0.75 degrees Celsius (maximum value)

ta 30 ° C to 50 ° C, TD 60 ° C to 100 ° C ± 1.0 ° C (maximum value)

TA 0 ° C to 85 ° C, TD 25 ° C to 125 ° C ± 3.0 ° C (maximum value)

Application

] Computer system thermal management

(for exampleOffice Electronics

Absolute maximum rated value (Note 1)

Power voltage -0.3 V to 6.0 V

SMBData, SMBCLK Voltage, alarm, t_crit_a 0.5V to 6.0V of the voltage at 5.3 V to (VDD+0.3 il)

d-input current ± 1 mia

All other others The input current of the pin (Note 2) ± 5mAh

Packaging input current (Note 2) 30 mAh

SMBDATA, alert, T_crit_a output

exchange current 10 10 Mia

Storage temperature -65 ° C to +150 degrees Celsius

Welding information, lead temperature

SOIC-8 or MSOP-8 packaging (Note 3)

Qi Phase (60 seconds) 215 ℉

Infrared (15 seconds) 220 degrees Celsius

Static discharge sensitivity (Note 4)

Human model 2000 v

Machine model 200 v

Rate -rate run (Note 1, 5)

Work temperature range: 0 ° C to+125 ° C

Electric characteristics [123 ]

Temperature range tmin ≤ TA ≤TMAX

LM86 0 degrees Celsius ≤TA ≤+85 degrees Celsius

Power voltage range (VDD)+3.0V to+3.6V

] Temperature-Digital Converter Features

Unless otherwise explained, these specifications are suitable for VDD +3.0VDC to 3.6VDC. The black body limit is suitable for TA TJ Tmin ≤ TA ≤TMAX; all other limit ta TJ +25 ° C, unless there is another instructions.

SMBUS digital switch features unless otherwise explained, these specifications are applicable to VDD +3.0 VDC to +3.6 VDC, CL (load capacitance) on the output line 80 80 PF. The thickness limit is suitable for ta tj tmin to TMAX; all other restrictions

ta tj +25 degrees Celsius, unless otherwise explained. The switching characteristics of LM86 fully meet or exceed the release specifications of the SMBUS version 2.0. The following parameters are the timing between SMBCLK and SMBData signals related to LM86. They follow but not necessarily SMBUS bus specifications.

SMBUS digital switch features unless otherwise explained, otherwise thisSome specifications are suitable for VDD +3.0 VDC to +3.6 VDC, and the CL (load capacitance) 80 PF on the output cable. The thickness limit is suitable for ta tj tmin to TMAX; all other restrictions

ta tj +25 degrees Celsius, unless otherwise explained. The switching characteristics of LM86 fully meet or exceed the release specifications of the SMBUS version 2.0. The following parameters are the timing between SMBCLK and SMBData signals related to LM86. They follow but not necessarily SMBUS bus specifications.

Note 1: Absolute maximum rated value indicates the limit that the device may be damaged. During operation, DC and AC electrical specifications that exceed the rated working conditions.

Note 2: When the input voltage (VI) of any pin exceeds the power supply (VI LT; GND or VI GT; VDD), the current of the pin should be limited to 5 millianges.

The figure below shows the parasitic element and/or ESD protection circuit of the LM86 pin. The nominal breakdown voltage of D3 is 6.5 V. Be careful not to make the parasite diode D1 positive bias, appear in the pin: D+, D-. Over 50 millivol to do this may damage the temperature measurement.

Note 3: Other suggestions and methods for welding surface installation equipment.

Note 4: Human model, 100PF passes through the 1.5kΩ resistor. Machine model, 200pf, directly discharge each foot.

Note 5: When connected to a printing circuit board with 2 ounces of foil, connect to the thermal resistance of the environment: —SOIC-8 168 degrees Celsius/tile — MSOP-8 210 degrees Celsius/tile [123 123 [123 ]

Note 6: The typical value is TA 25 ° C, which represents the most likely parameter model.

Note 7: The limit is guaranteed to be the country's AOQL (the average factory quality level).

Note 8: Local temperature accuracy does not include the effect of self -heating. The temperature increase caused by self -heating is the loss and thermal resistance of the product of the internal energy LM86. See thermal resistance used in self -heating calculations (Note 5).

Note 9: SMBUS will not significantly increase static current.

Note 10: This specification is only used to illustrate the update frequency of temperature data. You can read LM86 at any time instead of the conversion state (and the final conversion result will be generated).

Note 11: The default value set when power -on.

Note 12: The measurement range of the output rising time is (the maximum+0.15V) to (vehicle identification number (1) minimum -0.15V).

Note 13: The measurement range of the output drop time is (vehicle identification number (1) min-0.15V) to (vehicle identification number (1) min+0.15V).

Note 14: Keeping SMBData and/or SMBCLK rows at a low level than TTIMEOUT will reset the SMBUS state of LM86, so SMBData and SMBCLK pins are in high impedance state.

1.0 function description

The temperature sensor of the LM86 temperature sensor contains an incremental VBE-based temperature sensor based on local or remote diode and a 10-bit plus ADC (Delta-Sigma modulus modulus converter). LM86 is compatible with serial SMBUS

2.0 version of the dual -line interface. The local temperature (LT) measured by the digital comparator reaches the local high temperature (LHS), local low (LLS), and local temperature critical (LCS) user programmable temperature limit registers. The measured remote temperature (RT) and the remote high temperature (RHS), the remote low temperature (RLS) and the remote temperature critical value for the number (RCS) users can program the programmable temperature limit register. Activating alarm output indicates that the limit registers preset in the presets in the presets in the presets in the lower limit register are relatively greater than that of the alarm output. The t_crit_a output response is a real comparison internal lag. The stagnation is set to the stagnation register (Th). When the temperature is higher than the critical temperature setting value, the T_crit_a OC CURS is activated. Túu Crit 持 A keeps activating until the temperature is lower than the set value of the calculation of T 戋 U CRIT 戋 Th. The delay register affects the remote temperature and the number of local temperature. The power consumption of LM86 is very low (shutdown) mode, and the configuration register is set. In the shutdown mode, LM86 is closed when all circuits that are not needed. Local temperature reading and setting point data registers are 8 bits. The format data of the 11 -bit remote temperature is a 16 -bit left alignment. Two 8 -bit registers are high for each setting point and temperature reading. Two offset registers (RTOLB and RTOHB) can be used to compensate for non -ideal errors, and further discussions are further discussed in section 4.1 diode non -idealism. The remote temperature readings of the report are subtracted or added to the value of the offset register by subtracting or adding the actual temperature reading.

1.1 Conversion order

LM86 requires about 31.25 milliseconds to convert local temperature (LT), remote temperature (RT), and update all registers. Only in the conversion process, the busy position (D7) in the status register (02H) is high. These conversions are processed in the circular sequence. The conversion rate can be modified by the Con Version Rate Register (04H). When the conversion rate is to modify the insertion delay between conversion, the actual conversion time is maintained at 31.25 milliseconds. Different conversion interest rates will cause LM86 to extract different numbers of power currents as shown in Figure 2.

1.2 Alert Output

The alert pin of the LM86 is a activated low -opening output. The limit of the temperature setting point register is triggered by the external temperature conversion. The redesign of the alarm output depends on the choice of use. The LM86 warning needle is multifunctional. It will provide three different use method system designers: as a temperature comparator, as a temperature -based interrupt symbol, as a part of SMBUS's alarm system. The following three methods will be explained below. Alarm and interrupt method only have different interaction with LM86. Each temperature reading (LT and RT) and the critical setting value registers (LCS, RCS), high settings registers (LHS and RHS), and low settings registers (LLS and RLS). At the end of each temperature reading, comparison is determined whether the reading is higher than the high or t_crit set point or lower than its low setting point. If so, set the corresponding position in the state register. If the alarm cover is not high, any bit of registration set in the state, except for busy (D7) and opening (D2), will cause the alarm output to lower. Anyone exceeding the temperature setting value register will trigger an alarm. In addition, the alarm mask in the configuration register must be cleared to trigger the alarm in all modes.

1.2.1 The alarm output of the temperature comparator When the LM86 is implemented in one system, it provides services through the interrupt program. The alarm output can be used as a temperature comparator. In this way, the condition that the alarm becomes low is

1.0 function description (continued)

The alarm no longer exists, and the assertion will be canceled (Figure 3). For example, if the alarm output is activated by the Compari Son of LT GT; LHS, it will no longer return to a high position when this condition is no longer a real alert. This mode allows all registers to be configured during the setting process. In order to use the alarm as a temperature comparator, the filter and alarm configuration register (XBF) must be fixed. This is not the default state.

1.2.2 as an interrupt alarm output

The alarm output of LM86 can be simply realized as a routine for interrupt signal for triggering interrupt services. In this system, the interrupt logo is not desirable to repeat the trigger routine during the interrupt service period or before. Under this operation method, during the read status register, LM86 will set a warning shielding position (D7 of the register) (if there is) to set the bit in the state register, but busy (D7) and opening (d2). This can prevent further alert triggers until the host resets the end of the alarm shielding position interrupt service program. Just from the Master (see Figure 4), the next conversion will be converted if the trigger conditions continue. The alarm is used as a dedicated interrupt command signal. The bit D0 (alert configuration level) and alert configuration register (XBF) in the filter must be set to low. This is the defaultstate. The following sequence description system's response uses alarm output pins as interrupt marks:

1. Main sense official alarm low

2. The host read the LM86 status register to determine the cause of the alarm

3.lm86 Clear status register, reset the alarm high and set alarm mask position (configured in the register).

4. Note that the situation of the alarm is triggered. Fan start, set point limit adjustment, etc.

5. Master reset the alarm mask (registered in the configuration).

1.2.3 The alarm output of the SMBUS alarm is connected to one or more alarms, other SMBUS compatible devices and host output. Essence Based on this implementation, ARA (Apel) operates the alarm response address of the LM86) protocol. The SMBUS 2.0 ARA protocol, SMBUS specification 2.0 defines a program to help the main program solve the interrupt and service of the generated components, as little as possible when the system is interrupted. The SMBUS warning line is connected to all the devices on the bus and connects them together. This ARA is a method. Through a command SMBUS main server, you can recognize which part of the SMBUS warning line is reduced and prevent it from lowering the trigger conditions again. When all the devices on the bus when receiving the ARA command, the device of the SMBUS alert is low. First, send their addresses to the owner. The SMBUS 1.1 and 2.0 specifications are sent to ARA after confirmation. This SMBUS Beton of Smbalert " requires preventing the SMBUS warning line. The competitive part of theCOM can solve this "SMBalert separation " requirement different from LM86 or not at all. SMEs executing the ARA protocol system LM86 will be completely with all competitors with all competitors. Compatible. LM86 responds to ARA and releases alarm output pins by setting up the address by setting up the position D7 in the register (at the address 09h). . In order to enable the host to read the alarm of the status register