Datasheet

MSP430FW429, MSP430FW428
MSP430FW427, MSP430FW425, MSP430FW423
www.ti.com SLAS383E –OCTOBER 2003–REVISED DECEMBER 2013
Scan IF, Sample Capacitor/Ri Timing
(1)
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
Sample capacitance at SIFCHx
C
SHC(SIFCHx)
SIFEx(tsm) = 1, SIFSH = 1 2.2 V, 3 V 5 7 pF
pin
Serial input resistance at the
Ri
(SIFCHx)
SIFEx(tsm) = 1, SIFSH = 1 2.2 V, 3 V 1.5 3 kΩ
SIFCHx pin
t
Hold
Maximum hold time
(2)
ΔV
sample
< 3 mV 62 µs
(1) The minimum sampling time (7.6 x tau for 1/2 LSB accuracy) with maximum C
SHC(SIFCHx)
and Ri
(SIFCHx)
and Ri
(source)
is t
sample(min)
~ 7.6
× C
SHC(SIFCHx)
× (Ri
(SIFCHx)
+ Ri
(source)
) with Ri
(source)
estimated at 3 kΩ, t
sample(min)
= 319 ns.
(2) The sampled voltage at the sample capacitance varies less than 3 mV (ΔV
sample
) during the hold time t
Hold
. If the voltage is sampled
after t
Hold
, the sampled voltage may be any other value.
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