ISL23428
Serial Interface Specification
SYMBOL
t
RO
t
FO
t
CS
NOTES:
For SCK, SDI, SDO, CS Unless Otherwise Noted. (Continued)
TEST CONDITIONS
R
pu
= 1.5k, Cbus = 30pF
R
pu
= 1.5k, Cbus = 30pF
2
MIN
(Note 19)
TYP
(Note 7)
MAX
(Note 19)
60
60
UNITS
ns
ns
µs
PARAMETER
SDO Output Rise Time
SDO Output Fall Time
CS Deselect Time
7. Typical values are for T
A
= +25°C and 3.3V supply voltages.
8. LSB = [V(RW)
127
– V(RW)
0
]/127. V(RW)
127
and V(RW)
0
are V(RW) for the DCP register set to 7F hex and 00 hex respectively. LSB is the incremental
voltage when changing from one tap to an adjacent tap.
9. ZS error = V(RW)
0
/LSB.
10. FS error = [V(RW)
127
– V
CC
]/LSB.
11. DNL = [V(RW)
i
– V(RW)
i-1
]/LSB-1, for i = 1 to 127. i is the DCP register setting.
12. INL = [V(RW)
i
– i • LSB – V(RW)
0
]/LSB for i = 1 to 127
Max
V
RW
i
–
Min
V
RW
i
10
6
13. TC
= -----------------------------------------------------------------------------
---------------------
for i = 8 to 127decimal, T = -40°C to +125°C. Max( ) is the maximum value of the wiper voltage
-
V
V
RW
i
+25°C
+165°C and Min( ) is the minimum value of the wiper voltage over the temperature range.
14. MI = |RW
127
– RW
0
|/127. MI is a minimum increment. RW
127
and RW
0
are the measured resistances for the DCP register set to 7F hex and 00
hex respectively.
15. Roffset = RW
0
/MI, when measuring between RW and RL.
Roffset = RW
127
/MI, when measuring between RW and RH.
16. RDNL = (RW
i
– RW
i-1
)/MI -1, for i = 8 to 127.
17. RINL = [RW
i
– (MI • i) – RW
0
]/MI, for i = 8 to 127.
18.
Max
Ri
–
Min
Ri
10
-
TC
R
= ------------------------------------------------------
---------------------
Ri
+25°C
+165°C
6
for i = 8 to 127, T = -40°C to +125°C. Max( ) is the maximum value of the resistance and Min( ) is the
minimum value of the resistance over the temperature range.
19. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
20. It is preferable to ramp up both the V
LOGIC
and the V
CC
supplies at the same time. If this is not possible it is recommended to ramp-up the V
LOGIC
first followed by the V
CC
.
21. VMATCH = [V(RWx)i - V(RWy)i]/LSB, for i = 1 to 127, x = 0 to 1 and y = 0 to 1.
22. RMATCH = (RWi,x - RWi,y)/MI, for i = 1 to 127, x = 0 to 1 and y = 0 to 1.
8
FN7904.0
August 25, 2011
INTERSIL [ INTERSIL CORPORATION ]
