tca62746fg TOSHIBA Semiconductor CORPORATION, tca62746fg Datasheet - Page 14

• Manufacturer Part Number: tca62746fg
• Description: 16-output Constant Current Led Driver With Output Open/short Detection
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Reading Error Status Code
Switching to Normal Mode
When TCA62746 is working under the OOD and OSD modes, the above sequence signals can enable a system
controller to read Error Status codes through
The signal sequence sets TCA62746 to be in the Normal mode.
Description
In the OOD and OSD modes, the state of OE must be switched from “H” to “L”. And, then, TCA62746
would execute Open-/Short-circuit Detection as well as enabling output ports to drive current. At least
three “L” must be sampled at the “L” state of OE and the last “L” should be at least 2 µs after the falling
edge of OE . The occurrence of the last “L” results in the event that TCA62746 saves the detected error
status into the built-in shift register. Thus, when OE is at the voltage low state, the serial data cannot be
shifted into TCA62746 through SIN pin. The “L” and “1” shown in the above figure is sampled at the rising
edge of each SCK. Before reading the Error Status Code, the state of OE should be pulled up to “H” from
“L”, the output ports are closed and the detection is finished. Then, the error status saved in the built-in
register would be shifted out through SOUT pin bit by bit by sending SCK.
SLAT
SOUT
SCK
SCK
OE
OE
H
H
1
L
1
L
2
L
L
H
2
L
3
L
H
4
L
MIN 2 µ s
H
5
L
H
6
L
n ≥ 3
L
SOUT
Bit
15
“L” level
H
Error status code
Bit
14
pin.
H
14
Bit
13
H
Bit
12
H
Bit
11
H
Bit
10
TCA62746FG/FNG
2006-10-23