PCA9922BS NXP [NXP Semiconductors], PCA9922BS Datasheet - Page 11

• Manufacturer Part Number: PCA9922BS
• Description: 8-channel constant current LED driver with output error detection
• Manufacturer: NXP [NXP Semiconductors]

Fig 9.
Lower-case signal names are internal signals shown to aid understanding of timing.
Timing for a complete error detection sequence
error_detect_mode
fault_data[n-1:0]
shift_reg[n-1:0]
fault_load
SDO
CLK
SDI
OE
LE
enter error detect
previous serial data shifting out
command
clock in 1s for testing
optional clocks to
some number of
this must be min. 2 s wide
and 3 clocks minimum with
output enable LOW
shift halted
command
load fault
fault data
fault data MSB
fault data 8 bits
fault_load goes LOW
on this edge of OE
shift
resumed
at least 8 clocks
exit error detect
command
002aad208