Vccp Limit Registers; Additional Adc Functions For Voltage Measurements - Analog Devices dBCool ADT7473 Manual

ADT7473
V LIMIT REGISTERS
CCP
A ssoci ated wi th the V measureme t channel is a high and
CCP
low limit regi ster. Exceeding the progra
causes th e approp riate status bit to b
can also generate
SMBALERT
Register 0x46 V Low Limit = 0x0
CC P
Register 0x47 V High Limit = 0xF
CC P
Table 7 shows the input ranges of th
codes of the 10-bi t ADC.
When the ADC is r unning, it samples a
in put in 711 µs and averages 16 conv
me asurement takes nominally 11.38 s.
ADDITIONAL ADC FUNCTIONS FOR VOLTAGE
M EASUREMENTS
A n umber of other functions are ava
o ffer the system designer increased f
Turn-Off Averaging
F or each voltage measurement read om a value register,
16 r eadings have actually been mad
averaged before being placed into th
fast er conversio ns are needed, settin
Reg ister 2 (0x73) turns averaging of This effectively gives a
r eading 16 times faster (711 µs), but
n
mmed high or low limit
e set. Exce eding ei ther limit
interr upts.
0 default
F default
e analog inputs an d output
nd converts a vol tage
ersio ns to reduce noise; a
m
ilab le on the ADT7473 to
lexi bility.
fr
e in ternally and the results
e value register. W hen
g Bi t 4 of Configura tion
f.
th e reading may be noisier.
Bypass Voltage Input Attenuator
Set ting Bit 5 of Configuration Register 2 (0x73) removes the
attenuati on circuitry from the
to directly connect external sen
v oltage measurement inputs fo
ra nge of the ADC without the a
Single-Chann
S etting Bit 6 of Configuration R
ADT7473 in to single-channel A
m ode, the ADT7473 can be ma
c hannel only. If the internal AD
in u p t is read every 711 µs. The
se lected by writing to Bits [7:5] of the TACH1 minimum high
b e r yt egister (0x55).
Table 6. Pro gramming Single-
Bits [7:5] Reg . 0x55
001
010
101
110
1 11
C n o figuration Register 2 (0
Bit 4 = 1; aver aging off.
B it 5 = 1; bypass input attenuators.
B it 6 = 1; single-channel conver
TACH1 Minimum High Byte Register (0x55)
Bits [ 7:5] select ADC channel f
Rev. A | Page 14 of 76
V input. This al
CCP
sors or to resc
r other applicat
ttenuators is 0
el ADC Conve rsion
egister 2 (0x7
DC conversio
de to read a sin
T7473 clock is
ap propriate AD
Channel ADC
Channel Selected
V
CCP
V
CC
Remote 1 temperature
Local temperature
Remote 2 temperature
x73)
t m ode.
or single-chann
lows the user
ale the analog
ions. The input
V to 2.25 V.
3) places the
n mode. In this
gle voltage
used, the selected
C channel is
Mode
el convert mode.