Analog Devices │
5
MAX77831 Evaluation Kit
Evaluates: MAX77831
MAXUSB_INTERFACE#
The MAXUSB_INTERFACE# along with the companion
EV kit GUI software allows users to easily change the
MAX77831’s register settings with a Windows PC. Before
connecting the MAXUSB_INTERFACE# to the EV kit’s
MAXUSB_INTERFACE# connector (J5), make sure the
MAXUSB_INTERFACE# is configured with the following
settings:
● SW1, SW2 to ON Position (This enables I
2
C mode on
the MAXUSB_INTERFACE#.)
● VL Jumper (J5) to 1.8V (This sets the MAXUSB_
INTERFACE# VIO voltage.)
•
Warning:
Setting this incorrectly to 3.3V could
potentially damage the MAX77831 IC.
The MAXUSB_INTERFACE# also includes an on-board
LDO that can supply necessary voltage to V
IO
. If you are
using the MAXUSB_INTERFACE#, disconnect any exter
-
nal V
IO
supply from the EV kit, and make sure header
jumpers J3, J4, and 0Ω jumper R3 are installed to connect
the MAXUSB_INTERFACE# to the EV kit.
Table 2. MAX77831 R
SEL
Selection Table
Table 3. Feedback Resistor Value Recommendations
*
Default value installed on the EV kit
R
SEL
(Ω)
FEEDBACK
RESISTOR
SELECTION
TYPICAL
I
LIM
(A)
I
2
C SLAVE
ADDRESS
(7-BIT)
R
SEL
(Ω)
FEEDBACK
RESISTOR
SELECTION
TYPICAL
I
LIM
(A)
I
2
C SLAVE
ADDRESS
(7-BIT)
0*
Internal
Feedback
Resistors
7.0
110 0110 (0x66)
3740
External
Feedback
Resistors
7.0
110 0110 (0x66)
200
110 0111 (0x67)
8060
110 0111 (0x67)
309
110 1110 (0x6E)
12400
110 1110 (0x6E)
422
110 1111 (0x6F)
16900
110 1111 (0x6F)
536
5.6
110 0110 (0x66)
21500
5.6
110 0110 (0x66)
649
110 0111 (0x67)
26100
110 0111 (0x67)
768
110 1110 (0x6E)
30900
110 1110 (0x6E)
909
110 1111 (0x6F)
36500
110 1111 (0x6F)
1050
3.8
110 0110 (0x66)
42200
3.8
110 0110 (0x66)
1210
110 0111 (0x67)
48700
110 0111 (0x67)
1400
110 1110 (0x6E)
56200
110 1110 (0x6E)
1620
110 1111 (0x6F)
64900
110 1111 (0x6F)
1870
1.72
110 0110 (0x66)
75000
1.72
110 0110 (0x66)
2150
110 0111 (0x67)
86600
110 0111 (0x67)
2490
110 1110 (0x6E)
100000
110 1110 (0x6E)
2870
110 1111 (0x6F)
OPEN
110 1111 (0x6F)
DEFAULT
V
REF
(V)
R
TOP
R10 (kΩ)
R
BOT
R11 (kΩ)
STARTUP
V
OUT
(V)
PROGRAMMABLE V
OUT
RANGE (V)
V
OUT
STEP SIZE
(
mV)
0.333
160
20
3
3.0 to 9.0
44.1
178
20
3.3
3.0 to 9.9
48.5
Internal Feedback Resistors
5
4.5 to 15
73.5
312
12
9
8.1 to 15
132.3
232
6.65
12
10.7 to 15
175.8
234
5.3
15
13.5 to 15
221.2
