CMAXQUSB+ Maxim Integrated Products, CMAXQUSB+ Datasheet - Page 5

• Manufacturer Part Number: CMAXQUSB+
• Description: MODULE COMMAND SMBUS/I2C
• Manufacturer: Maxim Integrated Products

Specifications of CMAXQUSB+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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