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Table 4.
PCA9922
8-channel constant current LED driver with output error detection
Open-circuit detection
State of
output port
off
on
Condition of
output current
I O = 0 mA
I O < I th(det) [1]
I O ≥ I th(det) [1]
Error status code
0
1
channel n error status bit 0
Meaning
detection not possible
open circuit
normal
[1]
I th(det) = 0.5 × I O (target) (typical).
7.2.2 Short-circuit detection principle
The LED short-circuit detection compares the effective voltage level (V O ) with the
shorted-load detection threshold voltages V th(det)sc and V th(norm) . If V O is above the
V th(det)sc threshold, the PCA9922 detects a shorted-load condition. If V O is below the
V th(norm) threshold, no error is detected or error bit is reset. This error status can be read
as an error status code in the Special mode. For short-circuit error detection, a channel
must be on.
Table 5.
Shorted-load detection
State of
output port
off
on
Condition of
output voltage
I O = 0 mA
V O ≥ V th(det)sc
V O < V th(norm)
Error status code
0
1
channel n error status bit 0
Meaning
detection not possible
short circuit
normal
7.2.3 Entering error detect mode
Entering the error detect mode consists of a 5-clock sequence involving CLK, OE and LE
as shown in Figure 6 . The user must meet the set-up and hold times for OE and LE as
detailed in Table 10 to guarantee proper operation of the error detect circuitry. It should be
noted that the act of driving LE HIGH around the rising edge of clock 4 opens the latch in
the current control register block and data captured in the shift register at that point in time
is moved into the output control register. It should also be noted that the output logic was
enabled for a brief period of time while OE is LOW around the rising edge of clock 2. The
outputs LED[7:0] will glitch during this period.
CLK
LE
OE
002aad204
Fig 6.
Timing for ‘Enter Error Detect Mode’ command
PCA9922
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 6 April 2011
? NXP B.V. 2011. All rights reserved.
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