5
Electrical Characteristics (continued)
SC654
Parameter Symbol Conditions Min Typ Max Units
SemPulse Interface
Input High Threshold V
IH
V
IN
= 5.5V 1.6 V
Input Low Threshold V
IL
V
IN
= 2.9V 0.4 V
Input High Current I
IH
V
IN
= 5.5V -1 +1 µA
Input Low Current I
IL
V
IN
= 5.5V -1 +1 µA
Start up Time
(5)
t
SU
Only required when leaving shutdown mode 1 ms
Bit Pulse Duration
(6)
t
HI
0.75 250 µs
Duration Between Pulses
(6)
t
LO
0.75 250 µs
Hold Time - Address
(6)
t
HOLDA
Software limit — SPIF must be held high for this
amount of time to latch the data
550 5000 µs
Hold Time - Data
(6)
t
HOLDD
Software limit — SPIF must be held high for this
amount of time to latch the address
550 µs
Bus Reset Time
(6)
t
BR
Software Limit — SPIF must be held high for this
amount of time to force a bus system reset
12 ms
Shutdown Time
(7)
t
SD
Software Limit — SPIF must be held low for this
amount of time to disable device
10 ms
Notes:
(1) Capacitors are MLCC of X5R type. Production tested with higher value capacitors than the application requires
(2) SPIF is high for more than 10ms to place serial bus in standby mode
(3) Current matching is de ned as ± [I
BL(MAX)
- I
BL(MIN
] / [I
BL(MAX)
+ I
BL(MIN)
].
(4) Test voltage is V
OUT
= 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V
F
= 3.2V for white LEDs.
(5) The SemPulse start-up time is the minimum time that the SPIF pin must be held high to enable the part before starting communication.
(6) The source driver used to provide the SemPulse Output must meet these limits.
(7) The SemPulse shutdown time is the minimum time that the SPIF pin must be pulled low to shut the part down.
