LPC47M142-NC Standard Microsystems (SMSC), LPC47M142-NC Datasheet - Page 199

• Manufacturer Part Number: LPC47M142-NC
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47M142-NC

• Lead Free Status / RoHS Status: Not Compliant

Note 1: The period is 1/f
Note 2: When Bit 0 of the FANx registers is 0, then the duty cycle is programmed through Bits[6:1] of these
Note 1: t
Note 1: The blink rate is programmed through Bits[1:0] in LEDx register. When Bits[1:0]=00, LED is OFF.
SMSC DS – LPC47M14X
NAME
NAME
NAME
f
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.
programmed in the Fan Control register.
Bits[1:0]=01 indicates LED blink at 1Hz rate with a 50% duty cycle (0.5 sec ON, 0.5 sec OFF). Bits[1:0]=10
indicates LED blink at ½ Hz rate with a 25% duty cycle (0.5 sec ON, 1.5 sec OFF). When Bits[1:0]=11, LED
is ON.
out
TACH
t1
t2
t1
t2
t3
t1
t2
FANx
is +/- 2%.
LEDx
is the clock used for the tachometer counter. It is 30.52 * DVSR, where the divisor (DVSR) is
FAN_TACHx
PWM Period (Note 1)
PWM High Time (Note 2)
Pulse Time (1/2 Revolution Time=30/RPM)
Pulse High Time
Pulse Low Time
Period
Blink ON Time
out
,where f
FIGURE 46 – FAN TACHOMETER INTPUT TIMING
DESCRIPTION
DESCRIPTION
out
DESCRIPTION
t2
is programmed through the FANx and Fan Control registers. The tolerance on
FIGURE 45 – FAN OUTPUT TIMING
FIGURE 47 – LED OUTPUT TIMING
t2
t1
t1
Page 199
t1
t2
0.00033
t3
0.021
MIN
4t
3t
t
MIN
TACH
TACH
TACH
1
1
MIN
1
0
TYP
TYP
TYP
MAX
25.5
25.1
MAX
MAX
0.5
2
1
UNITS
UNITS
UNITS
msec
msec
µsec
µsec
µsec
sec
sec
Rev. 03/19/2001