LPC47M192-NW Standard Microsystems (SMSC), LPC47M192-NW Datasheet - Page 217

• Manufacturer Part Number: LPC47M192-NW
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47M192-NW

• Lead Free Status / RoHS Status: Compliant

Note 1: The period is 1/f
f
Note 2: When Bit 0 of the FANx registers is 0, then the duty cycle is programmed through Bits[6:1] of these registers.
If Bits[6:1] = “000000” then the FANx pin is low. The duty cycle is programmable through Bits[6:1] to be between
1.56% and 98.44%. When Bit 0 is 1, the FANx pin is high.
Note 1: t
programmed in the Fan Control register.
SMSC DS – LPC47M192
out
NAME
is +/- 2%.
t1
t2
t3
NAME
NAME
TACH
t1
t1
t2
Pulse Time (1/2 Revolution Time=30/RPM)
Pulse High Time
Pulse Low Time
FANx
MIDI_Tx
is the clock used for the tachometer counter. It is 30.52 * DVSR, where the divisor (DVSR) is
FAN_TACHx
MIDI Data Bit Time
PWM Period (Note 1)
PWM High Time (Note 2)
Data
out
DESCRIPTION
Start Bit
Idle (No Data)
,where f
DESCRIPTION
FIGURE 42 - FAN TACHOMETER INTPUT TIMING
Note: The MIDI bit clock is 31.25kHz +/- 1%
out
DESCRIPTION
t2
is programmed through the FANx and Fan Control registers. The tolerance on
FIGURE 41 - FAN OUTPUT TIMING
FIGURE 40 - MIDI DATA BYTE
DATASHEET
t1
t2
t1
Page 217
t1
Data
Data
4t
3t
t
MIN
TACH
TACH
TACH
0.00033
t3
0.021
MIN
1
1
31.7
MIN
TYP
TYP
TYP
32
Idle (No Data)
MAX
Stop Bit
MAX
25.5
25.1
MAX
32.3
UNITS
µsec
µsec
µsec
UNITS
UNITS
msec
msec
µsec
Rev. 03/30/05