F75133
6. Pin Description
I/OD12st
O12
- TTL level bi-directional pin with schmitt trigger., Open-drain outpu with 12 mA sink capability.
. .. - Output pin with 12 mA source-sink capability.
- Open-drain output pin with 12 mA sink capability.
- TTL level input pin with schmitt trigger.
OD12
INst
P
- Power.
Pin No
Pin Name
Type
P
PWR
Description
1
2
3
4
5
VDD
-
Main power supply voltage input with 3.3V.
SDA
SCL
VSS
VDD Serial data input/output. (5V Tolerance)
VDD Serial clock input. (5V Tolerance)
I/OD12st
INst
P
-
Ground.
TURBO#/STRAP
VDD General TURBO signal output pin. (5V Tolerance)
Power on strapping pin. (5V Tolerance)
O12
6
7
8
FAULT#
PME#
VDD General FAULT event pin. (5V Tolerance)
VDD General PME event pin. (5V Tolerance)
VDD PWM input sensor pin. (5V Tolerance)
OD12
OD12
INst
PWMIN
7. Function Description
7.1 General Description
As the below circuit, the F75133S can directly sense PWM controller’s duty cycle to find out the current
loading of equipments. In the past, if engineer would like to measure the consumption of parts, could put a
resistance between power and parts, then detected ∆V and capitalized the value to understand the loading
condition. Although the method is convenient and needs just a cheap resistance, but some of the accurate
issues and power consumption problem will be the critical points. For example, the resistance will cause more
consumption and heat questions if the end-equipment needs mass current to implement. Depends on these
problems, more accuracy and more efficiency sensor chip is necessary. The F75133S will handle previous
trouble.
-3-
2007
V0.28P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
