Fintek
3VCC
Voltage Inputs
Feature Integration Technology Inc.
F75373
(directly connect to the chip)
50K
VIN3.3
50K
VIN (Lower than 2.048V)
(directly connect to the chip)
VIN(Higher than 2.048V)
R1
R2
8-bit ADC
with
7.8125mV LSB
10K, 1%
Typical Thermister
Connection
R
THM
10K, 25 C
VREF
Pin 13
Pin 14/15
VIN1(Max2.048V)
R
Figure 5-3
5.2 Access Interface
The F75373S provides one serial access interface, Serial Bus, to read/write internal registers. The address of
Serial Bus is configurable by using power-on trapping. The pin 3 (PWMOUT1/ADDR_TRAP) is multi-function pin.
During power-on, this pin serves as input detection of logic high or logic low. This pin is default pull-down resistor with
100K ohms mapping the Serial Bus address 0x5A (0101_1010). Another Serial Bus address 0x5C (0101_1100) is
set when external pull-up resistor with 10K ohms is connected in this pin.
(a)
Serial bus write to internal address register followed by the data byte
0
SCL
SDA
Start By
Master
7
8
0
7
8
0
1
0
1
1
0
1
R/W
Ack
by
373S
D7
D6
D5
D4
D3
D2
D1
D0
Ack
by
373S
Frame 1
Serial Bus Address Byte
0
Frame 2
Internal Index Register Byte
7
SCL (Continued)
SDA (Continued)
D7
D6
D5
D4
D3
D2
D1
D0
8
Stop
by
Master
Frame 3
Data Byte
Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte
5
V0.25P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
