Datasheet

MAX31855 Evaluation Kit
Evaluates: MAX31855
6Maxim Integrated
Figure 2. MAX31855 EV Kit Schematic (Sheet 1 of 2)
1 2 3
J4
SO Jumper
GND
1
T-
2
T+
3
Vcc
4
SCK
5
CS
6
SO
7
NC
8
U1 MAX31855
in1
1
in2
2
GND
3
U4 NUP2105
in1
1
in2
2
GND
3
U2 NUP2105
C2
0.01uF
C3 DNP C4 DNP
C6
0.01uF
C7 DNP C8 DNP
C5 0.1uF C1 0.1uF
1 2
0603
L2 BLM18PG471
1 2
0603
L1 BLM18PG471
1 2
0603
L3 BLM18PG471
1 2
0603
L4 BLM18PG471
GND
1
T-
2
T+
3
Vcc
4
SCK
5
CS
6
SO
7
NC
8
MAX31855
U3
DNP
GND
GND GND
GND
GND
GND GND
GND
GND
GND
PCB Layout Notes 1. MAX31855 should be as close as possible to the thermocouple connector. 2. Use as much copper as possible between MAX31855 and connector (PCC-SMP-x-x). 3. Place decoupling CAP close to their voltage supply. 4. Use a large ground plane to improve the device’s temperature measurement accuracy.
3V3
3V3
TP11 DNP TP12 DNP
TP3
CS_BAR
TP2 SCK
TP1
SO
TP4 TP5 TP6 TP7
TP9 TP10
GND
3V3
SO
Jum
pe
m
m
r
in
1
1
in
2
2
G
N
D
3
U
4
NU
P
2
1
05
C
6
0.01u
F
C
7
D
N
P
C
8
DN
P
C
5
0
.
1
u
F
1
2
0603
L
3
B
L
M
18
P
G
4
7
1
1
2
0603
L
4
B
L
M1
8
P
G
4
7
1
G
N
D
D
D
1
T
-
2
T
+
3
Vc
c
c
c
4
SC
K
5
C
S
6
S
O
7
N
C
8
MAX
3
1
85
5
U
3
DN
P
GN
D
G
N
D
G
N
D
GN
D
G
N
D
3
V
3
T
P
12
DN
P
NOTE: Second circuit available for customer to add another type of thermocouple DNP U3 and J3. NOTE: All R, C and L footprints are 0805 unless otherwise stated.
+
-
PCC-SMP-x-x
J3
+
-
J2
PCC-SMP-K-5-ROHS
NOTE: U1 and J2 will be populated with K type thermocouple.
TP8
SO SCK CS