LM63CIMA/NOPB National Semiconductor, LM63CIMA/NOPB Datasheet - Page 16

• Manufacturer Part Number: LM63CIMA/NOPB
• Description: IC TEMP SENSR REMOTE DIODE 8SOIC
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM63CIMA/NOPB

• Function: Fan Control, Temp Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 85°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 1°C
• Supply Current: 1.3mA
• Supply Voltage Range: 3V To 3.6V
• Resolution (bits): 11bit
• Sensor Case Style: SOIC
• No. Of Pins: 8
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Accuracy %: 1°C
• For Use With: LM63EVAL - BOARD EVALUATION LM63
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM63CIMA; LM63CIMA

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4A
4B
Address
LM63 Register Descriptions In Functional Order
Fan Control Registers
Hex
HEX
HEX
4A
4B
FAN PWM AND TACHOMETER CONFIGURATION REGISTER
FAN PWM AND TACHOMETER CONFIGURATION REGISTER
Read/
Write
R/W
R/W
Bit
7:6
1:0
7:6
4:3
2:0
s
5
4
3
2
5
Value
POR
111
00
00
11
1
0
0
0
0
1
Tachometer
Tachometer
PWM Clock
[Reserved]
Duty Cycle
Program
Spin-Up
Spin-Up
Spin-Up
Polarity
Output
Name
Select
PWM
PWM
Mode
PWM
PWM
Time
Fast
These bits are unused and always set to 0.
0: the PWM Value (register 4C) and the Lookup Table (50–5F) are read-only. The
PWM value (0 to 100%) is determined by the current remote diode temperature
and the Lookup Table, and can be read from the PWM value register.
1: the PWM value (register 4C) and the Lookup Table (Register 50–5F) are read/
write enabled. Writing the PWM Value register will set the PWM output. This is also
the state during which the Lookup Table can be written.
0: the PWM output pin will be 0 V for fan OFF and open for fan ON.
1: the PWM output pin will be open for fan OFF and 0 V for fan ON.
if 0, the master PWM clock is 360 kHz
if 1, the master PWM clock is 1.4 kHz.
Always write 0 to this bit.
00: Traditional tach input monitor, false readings when under minimum detectable
RPM.
01: Traditional tach input monitor, FFFF reading when under minimum detectable
RPM.
10: Most accurate readings, FFFF reading when under minimum detectable RPM.
Smart-tach mode enabled. Use with direct PWM drive of fan power.
11: Least effort on programmed PWM of fan, FFFF reading when under minimum
detectable RPM. Smart-tach mode enabled. Use with direct PWM drive of fan
power.
Note: If the PWM Clock is 360 kHz, mode 00 is used regardless of the setting of
these two bits.
These bits are unused and always set to 0
If 0, the fan spin-up uses the duty cycle and spin-up time, bits 0–4.
If 1, the LM63 sets the PWM output to 100% until the spin-up times out (per bits
0–2) or the minimum desired RPM has been reached (per the Tachometer Setpoint
setting) using the tachometer input, whichever happens first. This bit overrides the
PWM Spin-Up Duty Cycle register (bits 4:3)—PWM output is always 100%.
Register x03, bit 2 = 1 for Tachometer mode.
If PWM Spin-Up Time (bits 2:0) = 000, the Spin-Up cycle is bypassed, regardless
of the state of this bit.
00: Spin-Up cycle bypassed (no Spin-Up), unless Fast Tachometer Terminated
Spin-Up (bit 5) is set.
01: 50%
10: 75%–81% Depends on PWM Frequency. See Applications Notes.
11: 100%
000: Spin-Up cycle bypassed (No Spin-Up)
001: 0.05 seconds
010: 0.1 s
011: 0.2 s
100: 0.4 s
101: 0.8 s
110: 1.6 s
111: 3.2 s
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Description