SC657ULTRT Semtech, SC657ULTRT Datasheet - Page 5

• Manufacturer Part Number: SC657ULTRT
• Description: Backlight Driver For 5 LEDs With SemPulseTM Interface
• Manufacturer: Semtech

Electrical Characteristics (continued)
Notes:
() Capacitors are MLCC of X5R type. Production tested with higher value capacitors than the application requires
(2) SPIF is high for more than 0ms to place serial bus in standby mode
(3) Current matching is defined as ± [I
(4) Test voltage is V
(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.
Parameter
SemPulse Interface
Input High Threshold
Input Low Threshold
Input High Current
Input Low Current
Start up Time
Bit Pulse Duration
Duration Between Pulses
Hold Time - Address
Hold Time - Data
Bus Reset Time
Shutdown Time
(5)
(6)
(7)
(6)
(6)
OUT
(6)
= 4.2V — a relatively extreme LED voltage — to force a transition during test. Typically V
(6)
BL(MAX)
Symbol
t
t
HOLDA
HOLDD
V
V
t
t
t
t
t
I
I
IH
SU
LO
BR
SD
IL
HI
IH
IL
- I
BL(MIN
] / [I
Software Limit — SPIF must be held high for this
Software limit — SPIF must be held high for this
Software limit — SPIF must be held high for this
BL(MAX)
Software Limit — SPIF must be held low for this
Only required when leaving shutdown mode
amount of time to force a bus system reset
+ I
amount of time to latch the address
amount of time to disable device
amount of time to latch the data
BL(MIN)
].
Conditions
V
V
V
V
IN
IN
IN
IN
= 5.5V
= 2.9V
= 5.5V
= 5.5V
Min
0.75
0.75
550
550
.6
2
0
-
-

F
= 3.2V for white LEDs.
Typ
Max
5000
250
250
0.4
+
+
SC657
Units
ms
ms
ms
µA
µA
µs
µs
µs
µs
V
V
5