Datasheet
Maxim Integrated
│
12
MAX31790 Evaluation Kit Evaluates: MAX31790
www.maximintegrated.com
Figure 5a. MAX31790 EV Kit Schematic (Sheet 1 of 4)
R1
4.7k
R2
4.7k
R3
4.7k
R4
4.7k
R5
1.21k
R6
1.21k
D7
FanFail
D8
FullSpeed
1
2
3
J4
WD_START
1
2
3
J3
SPIN_START
1
2
3
J2
FREQ_START
1
2
3
J8
PWM_START1
1
2
3
J7
PWM_START0
TP26
PWM_STRT1
1 B3
VFAN
VCC
VCC
GND GND
VCC
VCC
GND
VCC
GND
VCC
GND
GND GND
VCCVCC
TP25
PWM_ST RT0
TP1
FRQ_STRT
TP2
SPN_S TRT
TP3
W D_STRT
TP 4
ADD0
TP 5
ADD1
1
B1 VCC = 3.3V
1
B2
GND
1
2
J1
VCC JUMPER
C2
DNP
C1
0.1uF
GND
VCC
X1
CRYSTAL 12pF
+
C4
4.7uF 50VOLT
C3
4.7uF 50VOLT
VF AN
200 MIL TRACE
PWM_START1PWM_START0
FREQ_START
SPIN_START
WD_START
A DD1
A D D 0
SDA
SCL
SDA
SCL
SDA
SCL
FAN_FAIL#
FULL_SPEED#
TP 22
SDA
TP 23
SCL
TP 24
FAN_FAIL#
TP 27
FULL_SPD#
SDA
SCL
TP 6
GND
TP 8
GND
TP 7
GND
TP 30
GND
TP 31
GND
TP 32
GND
TP 33
GND
TP 29
VCC
PWMOUT4
TACH4
PWMOUT5
TACH5
PWMOUT6
TACH6
PWM_START0
PWM_START1
CL KOUT
FREQ_START
SPIN_START
WD_START
A DD0
ADD1
PWMOUT1
TACH1
PWMOUT2
TACH2
PWMOUT3
T
A
CH3
TP 37
VF AN
TP 34
GND
TP 35
GND
SL AVE ADDR= 40h - 5Eh
GND
RedLEDs
TP 28
CL KOUT
1
2
J11
CL KOUT
GND
R70
R80
R100
R90
C8
12pF
C9
12pF
GND
R11
100
VDUT
GNDDUT
FRQ_STRT:
GND = 30Hz
UNCONNECTED = 1.47 kHz
VCC = 25kHz
SPIN_STRT:
GND = NO SPIN-UP
UNCONNECTED = 0.5s MAX
VCC = 1.0s MAX
WD_STRT:
GND = NO WATCHDOG
VCC = 30s
POR CONDITION
PWM_STRT0 PWM_STRT1 PWM DUTY CYCL E (%)
GND GND
GND UNCONNECTED 30
GND VCC
UNCONNECTED GND 50
UNCONNECTED VCC 60
VCC GND
VCC VCC
1 2
3 4
5 6
7 8
J5
HDR_8P IN
1 2
3 4
5 6
7 8
J6
HDR_8P IN
FREQ_START
1
S
PIN_S
T
AR
T
2
XTAL2
6
ADD0
4
WD_START
5
ADD1
3
XTAL1
7
GND
8
TACH6
9
PWMOUT6
10
TAHC5
11
PWMOUT5
12
TACH4
13
PWMOUT4
14
TACH3
1
5
PWMOUT3
16
TACH2
17
PWMOUT2
18
TACH1
19
P
W
M
O
UT1
20
VCC
21
SDA
22
SCL
23
FAN_FAIL
24
PWM_START0
25
PWM_START1
26
FULLSPEED
27
CL KOUT
28
F
R
E
Q
_
S
T
A
R
T
S
P
I
N
_
S
T
A
R
T
X
T
A
L
2
A
D
D
0
W
D
_
S
T
A
R
T
A
D
D
1
X
T
A
L
1
GN
D
T
A
C
H
6
P
W
MOUT
6
T
AHC
5
P
W
MOUT
5
T
A
C
H
4
P
W
M
OU
T
4
T
A
C
H
3
P
W
M
O
U
T
3
T
A
C
H
2
P
W
M
O
U
T
2
T
A
C
H
1
P
W
M
O
U
T
1
V
C
C
S
DA
SC
L
F
AN
_
F
A
I
L
P
W
M
_
START
0
P
W
M
_
START
1
F
U
L
L
S
P
EE
D
C
L
K
OU
T
U1
MAX31790
SDA
SCL
FAN_FAIL#
FULL_SPEED#
PWM_ST ART0
PWM_S TART1
CLKOUT
FREQ_START
SPIN_START
WD_START
ADD0
ADD1
PWMOUT4
TACH4
PWMOUT5
TACH5
PWMOUT6
TACH6
GND
PWMOUT1
TACH1
PWMOUT2
TACH2
PWMOUT3
TACH3
VDUT
This is the through hole footprint for the SM placement on PC
1
2
3
4
5
6
7
J9A
DNP (28 PIN ROUND DB)
8
9
10
11
12
13
14
J9B
28 PI N ROUND DB
15
16
17
18
19
20
21
D
J9C
28 PI N ROUND DB
22
23
24
25
26
27
28
J9D
28 PI N ROUND DB
FAN_FAIL#
FULL_SPEED#
SDA_PIC
SCL _PIC
P7
P6
SL AVE ADDRESS SEL ECT PINS
CONFIGURE POWER UP
SAMPLED PIN
ADDITIONAL TE ST PO IN TS
EV KIT LAYOUT NOTE: Use recom mended PCB layout for crystal traces
MAX31790 Circuitr
y