W83627DHG Datasheet, PDF (44/268 Pages) Winbond – WINBOND LPC I/O

W83627DHG
R1 and R2 can be set to 56 KΩ and 10 KΩ, respectively, to reduce V₀ from +12 V to less than 2.048 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.
V_in
= VCC ×
34KΩ
34KΩ + 34KΩ
≅ 1.65V
,
where
VCC
is
set
to
3.3V
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:
VIN1 = (V 1 − 2.048) × ^R4 + 2.048, whereV 1 = −12
R3 + R4
R3 and R4 can be set to 232 KΩ and 10 KΩ, respectively, to reduce negative input voltage V₁ from –12
V to less than 2.048 V.
Both of these solutions are illustrated in the figure above.
7.3.2 Voltage Detection
The data format for voltage detection is an eight-bit value, and each unit represents an interval of 8 mV.
Detected Voltage = Reading * 0.008 V
If the source voltage was reduced, the detected voltage value may have to be scaled up accordingly.
7.3.3 Temperature Sensing
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
8-BIT DIGITAL OUTPUT
8-BIT BINARY
8-BIT HEX
0111,1101
7Dh
0001,1001
19h
0000,0001
01h
-
-
0000,0000
00h
-
-
1111,1111
FFh
1110,0111
E7h
1100,1001
C9h
9-BIT DIGITAL OUTPUT
9-BIT BINARY
9-BIT HEX
0,1111,1010
0FAh
0,0011,0010
032h
0,0000,0010
002h
0,0000,0001
001h
0,0000,0000
000h
1,1111,1111
1FFh
1,1111,1110
1FFh
1,1100,1110
1CEh
1,1001,0010
192h
Publication Release Date: Aug, 22, 2007
-32-
Version 1.4