U2480B
| Model | U2480B |
| Description | Automotive Lamp Outage Monitor |
| PDF file | Total 8 pages (File size: 337K) |
| Chip Manufacturer | TEMIC |
U2480B
Detailed Block Diagram
16
22 V
15
22 V
17
22 V
+
–
Power-
on
reset
I
th
Oscillator
7V
Divider
Clock 1
T
osc
x2
T1
Ref
E1
Ref
E1
E2
Ref
E1
Ref
E1
K3
K2
Forward and return counter
T = 1.2 s
Start
forward
Start
return
K4
14
K5
T2
T1
Reset
Latch for indicator
and stop lamps
Out
Set
+
–
V
out
High at
counter end
High at
counter zero
Set
Out
Clock 2
T
osc
x20
T2
+
–
K1
Voltage drift
of comparator
threshold
I
th
= f (V
S
)
10
23 V
Stabilized
voltage
V
stab
= 5.5 V
13
7V
8
Osc
V
stab
V
S
3
2
20
19
21
5
4
27
26
Reset
1
28
23
22
24
7
8
Ref
E1
Ref
E1
E2
Ref
E1
K6
K7
Forward and return counter
T = 1.2 s
K8
Start
forward
Start
return
High at
counter end
High at
counter zero
+
–
25 V
11
BL
12
Latched at
signal ”low”
+
–
SP
9
13910
Figure 1. Block diagram
2 (8)
TELEFUNKEN Semiconductors
Rev. A1, 22-Oct-97
