DM164 SITI [Silicon Touch Technology Inc.], DM164 Datasheet - Page 14

• Manufacturer Part Number: DM164
• Description: 8x3-CHANNEL CONSTANT CURRENT LED DRIVER
• Manufacturer: SITI [Silicon Touch Technology Inc.]

Open Detection
If there is any one of the 24 LEDs open or disconnected, the DM164 can detect and report
the error. The open detection circuit works when the following two conditions are met
simultaneously:
1. IOUTn is on (IOUTn > 200ns and EN_B=”L”).
2. When the output voltage at IOUTn is less than 0.2 V
The open error signal (OPE) has two methods to communicate the error signals to the
system. One is through serial output data to indicate which channel has failure (OPEn=H
=> IOUTn is open). The other is by means of dedicated Alarm pin when EN_B=L.
Status Information Output
When the DM164 operates at GD mode, after the LTH signal latches the input data from
shift registers to the data latches, the shift registers data will be replaced by the status
information. The status information includes the thermal error signals (Shutdown, T130
and T170,), open error signals (OPE) and dot correction data (DC), which will be
transferred out from DOUT pin. Figure 6 shows the status information format.
(a. IOUT shut down => Shut down=L, b. Tj>130℃ => T130=H, c. Tj>170℃ => T170=H)
DC[6]
8x3-CHANNEL CONSTANT CURRENT LED DRIVERS
MSB
383
23
DC IOUT23
...
...
8-bit
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DC[0]
DC[6]
DC[6]
377
335
23
20
47
02
DC IOUT20
DC IOUT02
OPE
376
...
...
...
...
23
8-bit
8-bit
16-bit
DC[0]
DC[0]
Figure 6. Status Information Data Format (ER[383:0])
375
Shut
down
329
41
20
02
‧
‧
‧
16-bit
16-bit
T130
OPE
OPE
374
328
40
20
02
8-bit
T170
373
327
X
X
39
Reserved
Reserved
...
...
...
...
...
...
368
320
X
X
X
32
DC[6]
DC[6]
DC[6]
367
319
31
22
19
01
DC IOUT22
DC IOUT19
DC IOUT01
...
...
...
...
...
...
8-bit
8-bit
8-bit
DC[0]
DC[0]
DC[0]
361
313
25
22
19
01
‧
‧
‧
16-bit
16-bit
16-bit
OPE
OPE
OPE
360
312
24
22
19
01
359
311
X
X
X
23
Reserved
Reserved
Reserved
...
...
...
...
...
...
Version:A.002
352
304
X
X
X
16
DC[6]
DC[6]
DC[6]
351
303
15
21
18
00
DC IOUT21
DC IOUT18
DC IOUT00
...
...
...
...
...
...
8-bit
8-bit
8-bit
DC[0]
DC[0]
DC[0]
345
297
21
18
00
9
‧
‧
‧
16-bit
16-bit
16-bit
OPE
OPE
OPE
344
296
21
18
00
8
343
295
X
X
X
7
Reserved
Reserved
Reserved
...
...
...
...
...
...
DM164
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X
X
X
0