W83L785R Datasheet, PDF (11/38 Pages) Winbond – WINBOND H/W MONITORING IC FOR NOTEBOOK

W83L785R/W83L785G
6.3 Monitoring Time
The W83L785R/G monitoring time includes temperature’s conversion time, voltage’s conversion time,
and fan’s count time. The W83L785R/G sample rate is 22.5 KHz. The temperature’s conversion time
need 24 cycles (worst case). The voltage’s ADC conversion time need 16 cycles (worst case). The fan
conversion cycle is divisor * count cycles. The W83L785R/G has 4 sets voltage, 2 sets temperature,
and 2 sets fans.
2 sets temperature monitor time: 2 * 24*0.044mS= 2.112 mS
4 sets voltage: 4 * 16 * 0.044 = 2.816 mS
EX: fan=4000RPM
Divisor =2, count=169
Fan transform time=0.044*2*169=14.872mS
2 Fan transform time= 14.872 mS * 2 = 29.744 mS
Total monitor time = 2.8+2.1+29.7= 34.6 mS
6.4 Analog Inputs
The maximum input voltage of the analog pin is 2.048V because the 8-bit ADC has the 8mv LSB.
Actually, the application of the voltage monitoring would most often be connected to power suppliers.
The +1.5V voltage can directly connected to these analog inputs. The +2.5V and CPU VOCRE, the
inputs higher than 2.048V, should be reduced a factor with external resistors so as to obtain the input
range. As Figure 3 shows.
Positive Inputs
VIN0(VCORE)(Max2.048V)
VIN2 _+1.5V
VIN3 _VCC
Pin 16
Pin 15
Pin 20
+2.5Vin ^{R1 VIN1(Max2.048V) Pin 14}
100K, 1%
R2
100K, 1%
8-bit ADC
with
8mV LSB
Typical Thermister
Connection
**The connections of CPUT2
is same as CPUT1
R
10K, 1%
VREF
CPUT1
RTHM
10K, 25 C
Pin 17
Pin 19
Figure. 3.
Publication Release Date: Apr. 2006
-7-
Revision 1.1