AAT2400 Datasheet, PDF (18/32 Pages) Skyworks Solutions Inc. – Sixteen-Channel White LED Driver Solution

DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Temperature Fault Conditions
Two thermal limits are reported in each AAT2400/2401
device. The first thermal limit serves as a warning that
the device is heating up. When this condition is reported,
the system can compensate by lowering the current lev-
els of the current sinks. The second thermal limit is the
maximum temperature allowed. When this temperature
is reached, the control registers are reset to 0 which dis-
ables all current sinks. In addition, the boost converter in
the master device is disabled. To resume operation, the
control registers must be reset, and all of the configura-
tion registers must be reprogrammed, since data reten-
tion at the maximum temperature is not guaranteed.
ADDR:
E8h
OTMP1:
Reports the Temperature Condition
of the Master IC (CS8 to CS1)
Bit
Bit Name Default Access
Description
1:0 OTMP 1 00h
2 Config
0h
R
R/W
00: Tj < T1
01: T1 < Tj < T2
11: T2 < Tj
0: Report T1 and T2
Thermal Limits on
Fault pin
1: Report only T2 Ther-
mal Limit on Fault pin
Table 15: OTMP1 Settings.
ADDR:
EAh
OTMP2:
Reports the Temperature Condition
of the Slave IC (CS16 to CS9)
Bit
Bit Name Default Access
Description
1:0 OTMP 2 00h
2 Config
0h
R
R/W
00: Tj < T1
01: T1 < Tj < T2
11: T2 < Tj
0: Report T1 and T2
Thermal Limits on
Fault pin
1: Report only T2 Ther-
mal Limit on Fault pin
Fault Reporting Registers
Each individual sink’s fault reporting can be configured to
the following cases: LED string becomes open, LED string
becomes short completely, reporting both or report none.
To turn this feature off, set two bits to ‘11’. Setting the
two bits to ‘01’ and ‘10’ means reporting short condition
only or reporting open condition only accordingly. To
report both faulty conditions, set the two bits to ‘00’.
ADDR: F0h
Fault Reporting 1:
Individual Sink Fault Reporting
Bit Bit Name Default Access
1:0 CS1 Fault
10h
R/W
3:2 CS2 Fault
10h
R/W
5:4 CS3 Fault
10h
R/W
7:6 CS4 Fault
10h
R/W
Description
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
00: report both;
01: report short
only; 10: report
open only; 11:
report none.
Table 17: Fault Reporting Register 1 Settings.
Table 16: OTMP2 Settings.
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