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NXP Semiconductors
PCU9955
16-channel UFm I 2 C-bus 57 mA constant current LED driver
Table 19. Static characteristics …continued
V DD = 3 V to 5.5 V; V SS = 0 V; T amb = ? 40 ? C to +85 ? C; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Overtemperature protection
T th(otp)
overtemperature protection
threshold temperature
rising
hysteresis
125
-
145
20
160
-
? C
? C
[1]
V DD must be lowered to 0.8 V in order to reset part.
14. Dynamic characteristics
Table 20. Dynamic characteristics
All the timing limits are valid within the operating supply voltage and ambient temperature range; V DD = 3 V ? 0.2 V and
5.5 V ? 0.3 V; T amb = ? 40 ? C to +85 ? C; and refer to V IL and V IH with an input voltage of V SS to V DD .
Symbol
f USCL
t BUF
t HD;STA
t SU;STA
t SU;STO
t HD;DAT
t SU;DAT
t LOW
t HIGH
t f
t r
t SP
Parameter
USCL clock frequency
bus free time between a STOP and START condition
hold time (repeated) START condition
set-up time for a repeated START condition
set-up time for STOP condition
data hold time
data set-up time
LOW period of the USCL clock
HIGH period of the USCL clock
fall time of both USDA and USCL signals
rise time of both USDA and USCL signals
pulse width of spikes that must be suppressed by the
Conditions
[1]
Min
0
0.08
0.05
0.05
0.05
10
30
50
50
-
-
-
Typ
-
-
-
-
-
-
-
-
-
-
-
-
Max
5
-
-
-
-
-
-
-
-
50
50
10
Unit
MHz
? s
? s
? s
? s
ns
ns
ns
ns
ns
ns
ns
input filter
[1]
Minimum USCL clock frequency is limited by the bus time-out feature, which resets the serial bus interface if either USDA or USCL is
held LOW for a minimum of 25 ms. Disable bus time-out feature for DC operation.
USDA
0.7 × V DD
0.3 × V DD
t BUF
t r
t f
t HD;STA
t SP
t LOW
USCL
0.7 × V DD
0.3 × V DD
t HD;STA
t SU;STA
t SU;STO
P
S
t HD;DAT
t HIGH
t SU;DAT
Sr
P
002aaf115
Fig 18. Definition of timing
PCU9955
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 2 October 2012
? NXP B.V. 2012. All rights reserved.
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