W83L786R/ W83L786G
7.4.1   Voltage Input can not be over 2.048V
The input voltage Vcore , Vram, VIN1 and VIN2 can be expressed as following equation:
2
1
2
5
.
2
2
R
R
R
V
VIN
V
+
?/DIV>
=
+
 
. V
+2.5V
 is +2.5V inputs.
The value of R1 and R2 can be selected to 100K Ohms and 100K Ohms, respectively, when the input
voltage is 2.5V. The node voltage of VIN2 can be subject to less than 2.048V for the maximum input
range of the 8-bit ADC. The pin 8 is connected to the power supply VCC with +3.3V. There are two
functions in this pin with 3.3V: the first function is to supply internal analog power of W83L786R/G and
the second function is to connect this pin to internal serial resistors to monitor the +3.3V voltage. The
values of two serial resistors are 20K ohms and 40K ohms so that input voltage to ADC is 1.1V which
is less than 2.048V of ADC maximum input voltage. The express equation can represent as follows.
V
K
VCC
V
in
1
.
1
40
20
20
E
?/DIV>
=
 
 
where VCC is set to 3.3V.
7.4.2   Voltage Fault (VOLTAGE_FAULT #)
W83L786R/G provides a good protection for voltage. Set Pin 26 (VOLTAGE_FAULT#) to monitor
voltage. When Vcore (Pin17), Vram (Pin18), VIN1 (Pin23), VIN2 (Pin24), or VCC (Pin8) voltage
exceeds high or low voltage limit in VR2B ~ VR34, Pin 26 VOLTAGE_FAULT# will be asserted (Figure
4).
F ig u r e 4 . V o lta g e F a u lt
V O L T A G E _ F A U L T #
V o lta g e H ig h lim it
V o lta g e L o w lim it
 
 
Publication Release Date: March 06
  - 11 -
Revision0.8
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