W83627DHG Nuvoton Technology Corporation of America, W83627DHG Datasheet - Page 44

• Manufacturer Part Number: W83627DHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

R1 and R2 can be set to 56 KΩ and 10 KΩ, respectively, to reduce V
The W83627DHG uses the same approach. Pins 12 and 95 provide two functions. One, these pins are
connected to VCC at +3.3 V to supply internal (digital / analog) power to the W83627DHG. Two, these
pins monitor VCC. The W83627DHG has two internal, 34-KΩ serial resistors that reduce the ADC-input
voltage to 1.65 V.
Pin 61 is implemented likewise to monitor its +3.3 V stand-by power supply.
Negative voltages are handled similarly, though the equation looks a little more complicated. For
example, negative voltage V1 (-12V) can be reduced according to the following equation:
R3 and R4 can be set to 232 KΩ and 10 KΩ, respectively, to reduce negative input voltage V
V to less than 2.048 V.
Both of these solutions are illustrated in the figure above.
7.3.2
The data format for voltage detection is an eight-bit value, and each unit represents an interval of 8 mV.
If the source voltage was reduced, the detected voltage value may have to be scaled up accordingly.
7.3.3
The data format for sensor SYSTIN is 8-bit, two's-complement, and the data format for sensors
CPUTIN and AUXTIN is 9-bit, two's-complement. This is illustrated in the table below.
TEMPERATURE
+125°C
+25°C
+1°C
+0.5°C
+0°C
-0.5°C
-1°C
-25°C
-55°C
Voltage Detection
Temperature Sensing
V
in
=
VIN
VCC
1
8-BIT BINARY
=
0111,1101
0001,1001
0000,0001
-
0000,0000
-
1111,1111
1110,0111
1100,1001
×
(
8-BIT DIGITAL OUTPUT
V
34
Detected Voltage = Reading * 0.008 V
1
−
K
. 2
34
Ω
048
+
K
Ω
34
)
×
K
Ω
R
8-BIT HEX
3
7Dh
19h
01h
-
00h
-
FFh
E7h
C9h
R
≅
+
4
. 1
-32-
R
65
4
+
V
. 2
, where VCC is set to 3.3V
048
,
whereV
9-BIT BINARY
Publication Release Date: Aug, 22, 2007
0,1111,1010
0,0011,0010
0,0000,0010
0,0000,0001
0,0000,0000
1,1111,1111
1,1111,1110
1,1100,1110
1,1001,0010
0
9-BIT DIGITAL OUTPUT
from +12 V to less than 2.048 V.
1
=
−
12
W83627DHG
0FAh
032h
002h
000h
1FFh
1CEh
192h
001h
1FFh
9-BIT HEX
Version 1.4
1
from –12