pca9922 NXP Semiconductors, pca9922 Datasheet - Page 15

• Manufacturer Part Number: pca9922
• Description: 8-channel Constant Current Led Driver With Output Error Detection
• Manufacturer: NXP Semiconductors

NXP Semiconductors
13. Dynamic characteristics
Table 10.
[1]
PCA9922_1
Product data sheet
Symbol
t
t
t
t
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
w(LE)
w(OE)
su(SDI)
h(SDI)
CLK
w(CLKH)
w(CLKL)
PD(CLK-SDO)
su(LE)
su(OE)
h(LE)
h(OE)
PD(OE-LEDH)
PD(OE-LEDL)
PD(LEH-LEDH)
PD(LEH-LEDL)
PD(CLKH-LEDH)
PD(CLKH-LEDL)
r
f
Applies to normal device operation. This pulse width does not apply to active HIGH times for executing error detect sequences.
Dynamic characteristics
Parameter
LE pulse width
OE pulse width
SDI set-up time
SDI hold time
frequency on pin CLK
clock duty cycle
CLK HIGH pulse width
CLK LOW pulse width
propagation delay
from CLK to SDO
LE set-up time
OE set-up time
LE hold time
OE hold time
propagation delay
from OE to LED HIGH
propagation delay
from OE to LED LOW
propagation delay
from LE HIGH to LED HIGH
propagation delay
from LE HIGH to LED LOW
propagation delay
from CLK HIGH to LED HIGH
propagation delay
from CLK HIGH to LED LOW
rise time
fall time
8-channel constant current LED driver with output error detection
Conditions
V
from SDI to CLK
from CLK to SDI
from LE to CLK
from OE to CLK
from CLK to LE
from CLK to OE
pins LED0 to LED7; V
C
I
pins LED0 to LED7; V
C
I
pins LED0 to LED7; V
C
I
OE = logic 0
pins LED0 to LED7; V
C
I
OE = logic 0
pins LED0 to LED7; V
C
I
OE = logic 0; LE = logic 1
pins LED0 to LED7; V
C
I
OE = logic 0; LE = logic 1
pins LED0 to LED7; V
C
I
pins LED0 to LED7; V
C
I
OE = logic 0
O
O
O
O
O
O
O
O
DD
L
L
L
L
L
L
L
L
Rev. 01 — 15 January 2009
= 20.7 mA; R
= 20.7 mA; R
= 20.7 mA; R
= 20.7 mA; R
= 20.7 mA; R
= 20.7 mA; R
= 20.7 mA; R
= 20.7 mA; R
= 30 pF; R
= 30 pF; R
= 30 pF; R
= 30 pF; R
= 30 pF; R
= 30 pF; R
= 30 pF; R
= 30 pF; R
= 3.3 V
L
L
L
L
L
L
L
L
= 15 ; V
= 15 ; V
= 15 ; V
= 15 ; V
= 15 ; V
= 15 ; V
= 15 ; V
= 15 ; V
ext
ext
ext
ext
ext
ext
ext
ext
= 910
= 910
= 910 ;
= 910 ;
= 910 ;
= 910 ;
= 910
= 910 ;
DD
DD
DD
DD
DD
DD
DD
DD
L
L
L
L
L
L
L
L
= 5.0 V;
= 5.0 V;
= 5.0 V;
= 5.0 V;
= 5.0 V;
= 5.0 V;
= 5.0 V;
= 5.0 V;
= 1.9 V;
= 1.9 V;
= 1.9 V;
= 1.9 V;
= 1.9 V;
= 1.9 V;
= 1.9 V;
= 1.9 V;
[1]
[2]
[3]
[3]
[3]
[3]
Min
10
200
5
5
0
-
16
16
-
20
20
5
5
-
-
-
-
-
-
-
-
Typ
-
-
-
-
-
50 to 50 60 to 40 %
-
-
-
-
-
-
-
210
210
210
210
210
210
175
190
PCA9922
© NXP B.V. 2009. All rights reserved.
Max
-
-
-
-
25
-
-
10
-
-
-
-
-
-
-
-
-
-
-
-
15 of 26
Unit
ns
ns
ns
ns
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns