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ADuM5401/ADuM5402/ADuM5403/ADuM5404 Data Sheet
Rev. D | Page 16 of 28
V
DD1
1
GND
1
2
V
OA
3
V
OB
4
V
ISO
16
GND
ISO
15
V
IA
14
V
IB
13
V
OC
5
V
IC
12
V
OD
6
V
ID
11
RC
OUT
7
V
SEL
10
GND
1
8
GND
ISO
9
ADuM5404
TOP VIEW
(Not to Scale)
06577-007
Figure 10. ADuM5404 Pin Configuration
Table 24. ADuM5404 Pin Function Descriptions
Pin No. Mnemonic Description
1 V
DD1
Primary Supply Voltage, 3.0 V to 5.5 V.
2, 8 GND
1
Ground 1. Ground reference for isolator primary. Pin 2 and Pin 8 are internally connected, and it is recommended
that both pins be connected to a common ground.
3 V
OA
Logic Output A.
4 V
OB
Logic Output B.
5 V
OC
Logic Output C.
6 V
OD
Logic Output D.
7 RC
OUT
Regulation Control Output. This pin is connected to the RC
IN
pin of a slave isoPower device to allow the ADuM5404
to control the regulation of the slave device.
9, 15 GND
ISO
Ground Reference for Isolator Side 2. Pin 9 and Pin 15 are internally connected, and it is recommended that both
pins be connected to a common ground.
10 V
SEL
Output Voltage Selection. When V
SEL
= V
ISO
, the V
ISO
setpoint is 5.0 V. When V
SEL
= GND
ISO
, the V
ISO
setpoint is 3.3 V.
11 V
ID
Logic Input D.
12 V
IC
Logic Input C.
13 V
IB
Logic Input B.
14 V
IA
Logic Input A.
16 V
ISO
Secondary Supply Voltage Output for External Loads, 3.3 V (V
SEL
Low) or 5.0 V (V
SEL
High).
TRUTH TABLE
Table 25. Truth Table (Positive Logic)
V
SEL
1
RC
OUT
2
V
DD1
(V) V
ISO
(V) Notes
H PWM 5 5 Master mode, normal operation
L PWM 5 3.3 Master mode, normal operation
L PWM 3.3 3.3 Master mode, normal operation
H PWM 3.3 5 This supply configuration is not recommended due to extremely poor efficiency
1
H refers to a high logic, and L refers to a low logic.
2
PWM refers to the regulation control signal. This signal is derived from the secondary side regulator and can be used to control other isoPower devices.
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