LM96163CISD/NOPB National Semiconductor, LM96163CISD/NOPB Datasheet - Page 20

• Manufacturer Part Number: LM96163CISD/NOPB
• Description: IC TEMP SENSOR DGTL REMOTE 10LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®, TruTherm®r

Specifications of LM96163CISD/NOPB

• Function: Fan Control, Temp Monitor
• Topology: ADC (Sigma Delta), Comparator, Register Bank, Tach
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 85°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-LLP
• Temperature Sensor Function: Temp Sensor
• Interface Type: Serial (2-Wire)
• Resolution: 10+SignBit
• Package Type: LLP EP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM96163CISDTR

www.national.com
Address
4A
Hex
HEX
4A
FAN PWM AND TACHOMETER CONFIGURATION REGISTER
Read/
Write
R/W
R
Bits
7:6
1:0
5
4
3
2
Value
POR
00
00
1
0
0
0
TACH1:TACH0
[Reserved]
[Reserved]
PWCLSL
PWPGM
PWOP
Name
These bits are unused and always read as 0.
PWM Programming enable
0: the PWM Value (register 0x4C), the PWM Smoothing (0x45[2:0]) and the
Lookup Table (Registers 0x50–0x67) 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 0x4C), the PWM Smoothing (0x45[2:0]) and the
Lookup Table (Registers 0x50–0x67) 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.
PWM Output Polarity
0: the PWM output pin will be 0V for fan OFF and open for fan ON.
1: the PWM output pin will be open for fan OFF and 0V for fan ON.
PWM Master Clock Select
0: the master PWM clock is 360 kHz
1: the master PWM clock is 1.4 kHz.
Always write 0 to this bit.
Tachometer Mode
00: Traditional tach input monitor, false readings when under minimum
detectable RPM. (Smart-TACH mode disabled)
01: Traditional tach input monitor, FFFFh reading when under minimum
detectable RPM. Smart-TACH mode enabled, PWM duty cycle not affected. Use
with direct PWM drive of fan power. TACH readings can cause an error event if
TACH setpoint register is set to less than FFFFh even though fan may be
spinning properly.
10: Most accurate readings, FFFFh reading when under minimum detectable
RPM. Smart-TACH mode enabled, PWM duty cycle modified. Use with direct
PWM drive of fan power. This mode extends the TACH monitoring low RPM
sensitivity.
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. This mode extends the TACH monitoring low RPM sensitivity the most.
Note: If the PWM Master Clock is 360 kHz, mode 00 is used regardless of the
setting of these two bits.
20
Description