A8287 ALLEGRO [Allegro MicroSystems], A8287 Datasheet - Page 13

• Manufacturer Part Number: A8287
• Description: LNB Supply and Control Voltage Regulator
• Manufacturer: ALLEGRO [Allegro MicroSystems]

Note that to add additional connec-
tions, e.g. SCL, SDA, IRQ, VIN,
EXTM, ADD, TDO, and TDI,
some modifi cations to the control
ground plane will be necessary.
Refer to Functional Block diagram
for circuit connections.
Power-on Reset I
V
SDA
IRQ
V
REG
IN
2
C Sequence
PCB Layout Diagram
Control 0V
C3
10
12
11
2
3
4
5
6
7
8
9
1
C2
LNB Supply and Control Voltage Regulator
C8
C4
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Switcher 0V
+
24
23
22
20
19
18
17
16
15
14
13
21
Master Responds to IRQ
Reads Status
VUV = 1
S
T
D1
+
D2
+
ADR
C5
Control 0V
0V
R
C6
A
C1
C9
(INPUT)
VIN
L1
READ
+
Control 0V
reset
VUV
A
VUV = 0
READ
N
S
P
R1
A8285/A8287
L2
Master Writes
Enables output
S
T
ADR
W
A
0V Plane
Tracking
Thermal Via
Cut in 0V Plane
C7
WRITE
A
S
P
OUTPUT
0V
13