LM63CIMAX National Semiconductor, LM63CIMAX Datasheet - Page 7

• Manufacturer Part Number: LM63CIMAX
• Description: IC,Motor Controller,MOS,SOP,8PIN
• Manufacturer: National Semiconductor

Specifications of LM63CIMAX

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND, unless otherwise noted.
Note 3: When the input voltage (V
components and/or ESD protection circuitry are shown below for the LM63’s pins. The nominal breakdown voltage of D3 is 6.5 V. Care should be taken not to forward
bias the parasitic diode, D1, present on pins D+ and D−. Doing so by more than 50 mV may corrupt temperature measurements. An "X" means it exists in the circuit.
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin. See Figure 1 above for the ESD
Protection Input Structure.
Note 5: Thermal resistance junction-to-ambient when attached to a printed circuit board with 2 oz. foil is 168˚C/W.
Note 6: See the URL “http://www.national.com/packaging/” for other recommendations and methods of soldering surface mount devices.
Note 7: “Typicals” are at T
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9: The supply current will not increase substantially with an SMBus transaction.
Note 10: Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the internal power
dissipation of the LM63 and the thermal resistance. See (Note 5) for the thermal resistance to be used in the self-heating calculation.
Note 11: The output rise time is measured from (V
Note 12: The output fall time is measured from (V
Note 13: Holding the SMBData and/or SMBCLK lines Low for a time interval greater than t
SMBDAT and SMBCLK pins to a high impedance state.
1.0 Functional Description
The LM63 Remote Diode Temperature Sensor with Inte-
grated Fan Control incorporates a ∆V
sensor using a Local or Remote diode and a 10-bit plus sign
∆Σ ADC (Delta-Sigma Analog-to-Digital Converter). The
pulse-width modulated (PWM) open-drain output, with a
pull-up resistor, can drive a switching transistor to modulate
the fan. When the ALERT/Tach is programmed to the Tach
mode the LM63 can measure the fan speed on the pulses
from the fan’s tachometer output. When the ALERT/Tach pin
is programmed to the ALERT mode the ALERT open-drain
output will be pulled low when the measured temperature
exceeds certain programmed limits when enabled. Details
are contained in the sections below.
The LM63’s two-wire interface is compatible with the SMBus
Specification 2.0 . For more information the reader is di-
rected to www.smbus.org.
Pin Name
V
D+
D−
PWM
ALERT/Tach
SMBDAT
SMBCLK
DD
PIN #
A
1
2
3
4
6
7
8
= 25˚C and represent most likely parametric norm. They are to be used as general reference values not for critical design calculations.
IN
) at any pin exceeds the power supplies (V
D1
X
X
BE
IH min
-based temperature
IL max
FIGURE 1. ESD Protection Input Structure
D2
X
X
X
X
X
X
+ 0.15 V) to (V
- 0.15 V) to (V
D3
X
IL min
IH min
- 0.15 V).
+ 0.15 V).
D4
IN
X
7
<
GND or V
In the LM63 digital comparators are used to compare the
measured Local Temperature (LT) to the Local High Setpoint
user-programmable temperature limit register. The mea-
sured Remote Temperature (RT) is digitally compared to the
Remote High Setpoint (RHS), the Remote Low Setpoint
(RLS), and the Remote T_CRIT Setpoint (RCS) user-
programmable temperature limits. An ALERT output will oc-
cur when the measured temperature is: (1) higher than either
the High Setpoint or the T_CRIT Setpoint, or (2) lower than
the Low Setpoint. The ALERT Mask register allows the user
to prevent the generation of these ALERT outputs.
The temperature hysteresis is set by the value placed in the
Hysteresis Register (TH).
The LM63 may be placed in a low power Standby mode by
setting the Standby bit found in the Configuration Register. In
the Standby mode continuous conversions are stopped. In
TIMEOUT
D5
X
X
IN
>
V+), the current at that pin should be limited to 5 mA. Parasitic
will reset the LM63’s SMBus state machine, therefore setting
D6
X
X
X
X
X
20057005
R1
X
X
X
X
SNP
X
X
X
X
ESD CLAMP
www.national.com
X
X
X