CMAXQUSB 查看數據表（PDF） - Maxim Integrated
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CMAXQUSB Datasheet PDF : 15 Pages
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CMAXQUSB User’s Guide
Connector P3
Connector P3 is a 20-pin, dual-row header that con-
nects to SMBus/I2C-based kits. The pinout is compati-
ble with Maxim’s previous SMBus/I2C solution, the
MAXSMBus board. See Table 1.
If designing a custom EV kit board, beware: the
ground return system does not connect pin 20.
Connector P4
Connector P4 is a 40-pin, dual-row header that con-
nects to SPI and 8-bit parallel kits. The pinout is com-
patible with Maxim’s previous SPI solution, the
68HC16MODULE board. See Table 2.
GPIO pins K1–K8 and K1’–K15’ must be driven with a
4.7kΩ or lower impedance source to turn around the
bidirectional level translators.
Table 1. Connector P3 Description
P3 PIN
LABEL
FUNCTION
1
VDD Power Supply. 2.5V, 3.3V, or 5V selected by CMAXQUSB VDD select jumper.
2, 4, 5, 6, 8, 10,
12, 14, 16, 18, 19
3
7
GND
SDA
SCL
Ground Return
SMBus/I2C SDA (Data)
SMBus/I2C SCL (Clock)
9
K6
General-Purpose I/O Designated as K6. Can be used for SMBus SUSPEND output.
11
K1
General-Purpose I/O Designated as K1. Can be used for SMBus ALERT input.
13
K2
General-Purpose I/O Designated as K2
15
K3
General-Purpose I/O Designated as K3
17
K4
General-Purpose I/O Designated as K4
Optional Unregulated Higher Voltage (7.5V to 16.5V) Power Supply. Enabled only if CMAXQUSB
20
+12V* jumper JU5 is installed and closed, and if external power is applied through connector P1.
*This +12V signal is provided only for legacy systems and is normally unpowered.
Table 2. Connector P4 Description
P4 PIN
LABEL
GPIO DESIGNATOR
FUNCTION
1–4
GND
—
Ground Return
5, 6
+12V*
Optional Unregulated Higher Voltage (7.5V to 16.5V) Power Supply.
—
Enabled only if CMAXQUSB jumper JU5 is closed, and if external power
is applied through connector P1.
7, 8
VDD
—
Power Supply. 2.5V, 3.3V, or 5V selected by CMAXQUSB VDD select
jumper.
9
RD
K13 when K0 = 1
Active-Low Read Strobe
10
WR
K14 when K0 = 1
Active-Low Write Strobe
11
CS0
K15 when K0 = 1
Active-Low Memory Chip-Select Strobe
12, 13, 14
—
—
No Connection. Reserved for additional memory chip-select strobes.
15
A0
K9 when K0 = 1
Memory Address LSB
16
A1
K10 when K0 = 1
Memory Address
17
A2
K11 when K0 = 1
Memory Address
18
A3
K12 when K0 = 1
Memory Address MSB
19
D0
K1 when K0 = 1
Memory Data LSB
*This +12V signal is provided only for legacy systems and is normally unpowered.
5
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