ISL22317 Datasheet, PDF (6/15 Pages) Intersil Corporation – Precision Single Digitally Controlled Potentiometer (XDCP™)

ISL22317
Operating Specifications Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
(Note 19) (Note 4) (Note 19) UNIT
t_F
SDA and SCL Fall Time
(Note 16)
From 70% to 30% of V_CC
20 +
0.1*Cb
250
ns
Cb
Capacitive Loading of SDA or SCL
(Note 16)
Total on-chip and off-chip
10
400
pF
Rpu
SDA and SCL Bus Pull-up Resistor Maximum is determined by t_R and t_F
1
kΩ
(Note 16) Off-chip
For Cb = 400pF, max is about 2kΩ ~ 2.5kΩ
For Cb = 40pF, max is about 15kΩ ~ 20kΩ
t_SU:A A1 Setup Time
Before START condition
600
ns
t_HD:A A1 Hold Time
After STOP condition
600
ns
NOTES:
4. Typical values are for T_A = +25°C and 3.3V supply voltage.
5. LSB: [V(R_W)₁₂₇ – V(R_W)₀]/127. V(R_W)₁₂₇ and V(R_W)₀ are V(R_W) 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.
6. ZS_ERROR = V(RW)₀/LSB.
7. FS_error = [V(RW)₁₂₇ – V_CC]/LSB.
8. DNL = [V(RW)_i – V(RW)_i-1]/LSB-1, for i = 1 to 127, where i is the DCP register setting.
9. INL = [V(RW)_i – i • LSB – V(RW)₀]/LSB for i = 1 to 127
10.
TC_V
=
-------^M-----^a----^x----⁽--^V----⁽---^R-----^W------⁾--ⁱ--⁾---–-----^M-----ⁱ--ⁿ----⁽--^V-----⁽--^R-----^W------⁾--ⁱ--⁾------ × ----¹---⁰----⁶----- ^{for i = 15 to 127 decimal, T = -40°C to +125°C. Max( ) is the maximum value of the wiper}
[Max(V(RW)_i) + Min(V(RW)_i)] ⁄ 2 +165°C voltage and Min ( ) is the minimum value of the wiper voltage over the temperature range.
11. MI = |RW₁₂₇ – RW₀|/127. MI is a minimum increment. RW₁₂₇ and RW₀ are the measured resistances for the DCP register set to 7F hex and
00 hex respectively.
12. R_OFFSET = RW₀/MI, when measuring between RW and RL.
13. R_DNL = (RW_i – RW_i-1)/MI -1, for i = 1 to 127.
14. R_INL = [RW_i – (MI • i) – RW₀]/MI, for i = 1 to 127.
15.
TC_R
=
----^[---^M-----^a----^x----⁽--^R-----ⁱ--⁾---–-----^M-----ⁱ--ⁿ----⁽--^R-----ⁱ--⁾--^]---- × ----¹----⁰---⁶-----
[Max(Ri) + Min(Ri)] ⁄ 2 +165°C
for i = 15 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.
16. Limits should be considered typical and are not production tested.
17. In rheostat mode, if a current is injected into the RW terminal, the magnitude of the current should be such that the developed potential difference
between RW and RL terminals is at least 300mV, even at the minimum wiper setting. This ensures that the recommended operating condition
of V(RW) ≥ V(RL) + 0.3V is satisfied and the part operates in its most accurate resistance. Minimum and Maximum wiper setting can be
calculated as follow, MIN code = (0.3V*127)/(Iw*Rtotal), Max code = [(V_CC - 0.3V)*127]/(I_W*R_TOTAL).
18. t_WC is the time from a valid STOP condition at the end of a Write sequence of I²C serial interface, to the end of the self-timed internal non-volatile
write cycle.
19. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
SDA vs SCL Timing
t_F
t_HIGH
t_LOW
t_R
t_sp
SCL
t_SU:STA
SDA
(INPUT TIMING)
SDA
(OUTPUT TIMING)
t_SU:DAT
t_HD:STA
t_HD:DAT
t_AA t_DH
t_SU:STO
t_BUF
6
FN6912.0
May 26, 2009