LPC47B272-MS SMSC, LPC47B272-MS Datasheet - Page 192

• Manufacturer Part Number: LPC47B272-MS
• Description: IC CTRLR SUPER I/O LPC 100-QFP
• Manufacturer: SMSC

Specifications of LPC47B272-MS

• Controller Type: I/O Controller
• Interface: LPC
• Voltage - Supply: 3.3V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1019

Note 1: t
Note 1: The blink rate is programmed through Bits[1:0] in LEDx register. When Bits[1:0]=00, LED is
SMSC LPC47B27x
NAME
NAME
t1
t2
t3
t1
t2
LEDx
FAN_TACHx
(DVSR) is programmed in the Fan Control register.
OFF. 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.
TACH
Pulse Time (1/2 Revolution Time=30/RPM)
Pulse High Time
Pulse Low Time
Period
Blink ON Time
is the clock used for the tachometer counter. It is 30.52 * DVSR, where the divisor
FIGURE 36 – FAN TACHOMETER INPUT TIMING
DESCRIPTION
DESCRIPTION
FIGURE 37 – LED OUTPUT TIMING
t2
DATASHEET
t1
t1
- 192 -
t2
t3
4t
3t
MIN
t
MIN
1
0
TACH
TACH
TACH
1
1
TYP
TYP
MAX
0.5
2
1
MAX
UNITS
Rev. 04-17-07
sec
sec
UNITS
µsec
µsec
µsec