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PDF PCA9922 Data sheet ( Hoja de datos )
| Número de pieza | PCA9922 | |
| Descripción | 8-channel Constant Current LED | |
| Fabricantes | NXP Semiconductors | |
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PCA9922
8-channel constant current LED driver with output error
detection
Rev. 01 — 15 January 2009
Product data sheet
1. General description
The PCA9922 is an 8-channel constant current LED driver designed for LED signage and
display applications. The output current is adjustable from 15 mA to 60 mA controlled by
an external series resistor. The outputs are controlled via a serial interface with a
maximum clock frequency of 25 MHz to allow for the system requirement of high volume
data transmission. Each of the 8 channel outputs has edge rate control to limit the change
in current when the outputs are enabled or disabled.
The device has built-in circuitry for detecting LED open-circuit and output short to ground.
After signaling the specified error detect sequence on the input control lines, error status
can be read out of the device via the serial data out.
The device is designed such that it may be cascaded with other similar devices. The SDO
pin contains the output of the shift register which may be used for cascading to the SDI pin
of the next device in the series. SDO changes state on the falling edge of CLK. SDI
captures data on the rising edge of CLK.
The PCA9922 is a pin-to-pin functionally equivalent 5 V alternative (exception: error data
is inverted; see Section 7.2.1, Section 7.2.2 and Section 7.2.7) for the ST2221A and
STP08CDC596.
The PCA9922 is available in DIP16, TSSOP16 and HVQFN20 packages and is specified
over the −40 °C to +85 °C industrial temperature range.
2. Features
www.DataSheet4U.com
I 25 MHz serial interface
I 3.3 V to 5.5 V operation
I 8 LED low side constant current outputs
I Global control for the 8 LED outputs variable between 15 mA to 60 mA
I 15 mA to 60 mA maximum current for all 8 output channels set by an external resistor
I Constant current matching at 25 °C, VDD = 5.0 V
I Bit-to-bit: ±6 %
I Chip-to-chip: ±10 %
I Gradual turn-on/turn-off output to limit EMI
I Error detection mode for line open, output short to ground, LED open and LED short
I −40 °C to +85 °C operation
I ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
1 page  
NXP Semiconductors
PCA9922
8-channel constant current LED driver with output error detection
6.2 Pin description
www.DataSheet4U.com
Table 3. Pin description
I = input; O = output.
Symbol Pin
Type
DIP16, HVQFN20
TSSOP16
VSS 1
SDI 2
19[1]
20
power supply
I
CLK 3 1 I
LE/DM1 4 2 I
LED0
5
3
O
LED1
6
4
O
LED2
7
5
O
LED3
8
6
O
LED4
9
10 O
LED5
10
11
O
LED6
11
12
O
LED7
12
13
O
OE/DM2 13 14 I
SDO
R_EXT
VDD
n.c.
14
15
16
-
15 O
16 analog input
17 power supply
7, 8, 9, 18 -
Description
supply ground
serial data in
serial data clock used to shift data on SDI
into the shift register
latch enable with internal pull-down
resistor; active HIGH signal used to
capture data in the shift register to present
to the outputs
Detection Mode 1
constant current LED output driver 0
constant current LED output driver 1
constant current LED output driver 2
constant current LED output driver 3
constant current LED output driver 4
constant current LED output driver 5
constant current LED output driver 6
constant current LED output driver 7
output enable with internal pull-up resistor;
active LOW signal used to allow data
captured in the latch to be presented to
the constant current outputs
Detection Mode 2
serial data output
external resistor input
supply voltage
not connected
[1] HVQFN20 package die supply ground is connected to both VSS pin and exposed center pad. VSS pin must
be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board
level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad
on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the
PCB in the thermal pad region.
PCA9922_1
Product data sheet
Rev. 01 — 15 January 2009
© NXP B.V. 2009. All rights reserved.
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CLK
SDI
shift_reg[n-1:0]
SDO
OE
LE
fault_load
fault_data[n-1:0]
error_detect_mode
enter error detect
command
some number of
optional clocks to
clock in 1s for testing
shift halted
load fault
command
at least 8 clocks
shift
resumed
previous serial data shifting out
fault data
fault data MSB
this must be min. 2 µs wide
and 3 clocks minimum with
output enable LOW
fault_load goes LOW
on this edge of OE
fault data 8 bits
exit error detect
command
002aad208
Lower-case signal names are internal signals shown to aid understanding of timing.
Fig 9. Timing for a complete error detection sequence
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet PCA9922.PDF ] | |
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