MAX3100EVKIT+ Maxim Integrated Products, MAX3100EVKIT+ Datasheet - Page 5

• Manufacturer Part Number: MAX3100EVKIT+
• Description: KIT EVAL FOR MAX3100
• Manufacturer: Maxim Integrated Products

Specifications of MAX3100EVKIT+

• Main Purpose: Interface, UART to SPI/Microwire
• Utilized Ic / Part: MAX3100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX3100 EV kit uses the MAXQ2000-RAX as a
host µC to communicate with the MAX3100 through the
SPI interface. The µC converts received characters to a
seven-segment LED display. The µC also implements a
master I
the on-board MAX6626 temperature sensor.
The EV kit has a MAX3232 RS-232 transceiver to facili-
tate communication with a PC.
The EV kit is designed as a DCE device. The J1 female
DB9 connector pin functions are shown in Figure 2. EV
kit TX line is connected to PC RX line. EV kit RX line is
connected to PC TX line. EV kit RTS line is connected to
PC CTS line. EV kit CTS line is connected to PC RTS line.
The data communication between the EV kit and the PC
only requires TX and RX lines.
The logic of the RTS line (J2, pin 4) on the EV kit is con-
trolled by the MAX3100’s RTS configuration bit. RTS = 1
sets the RTS line to logic 0. RTS = 0 sets the RTS line to
logic 1. The logic of the CTS line (J2, pin 5) on the EV
kit is controlled by the PC’s hardware flow control
(MAX3100’s CTS = 0, D3 = On; MAX3100’s CTS = 1,
D3 = Off).
Figure 2. EV Kit J1 Female DB9 Connector Pin Functions
Detailed Description of Hardware
2
C-compatible interface to communicate with
_______________________________________________________________________________________
MAX3100 Evaluation Kit
Bits B3–B0 in the MAX3100 write-configuration register
determine the baud-rate divisor (BRD), which divides
the X1 oscillator frequency. The MAX3100 internal oscil-
lator operates with either a 1.8432MHz or a 3.6864MHz
crystal, or is driven at X1 with a 45% to 55% duty-cycle
square wave. The MAX3100 IC data sheet shows BRDs
for given input codes, as well as the baud rate for
1.8432MHz and 3.684MHz crystals. The generator’s
clock is 16 times the baud rate.
On the EV kit board, a 3.684MHz crystal is installed. A
user can replace it with a 1.8432MHz crystal or remove
Y1 and apply an external square wave on the EXTERNAL
CLOCK pad.
A user should first set B3–B0 bits to the desired values
on SW6 and then press and release SW1 to configure
the MAX3100 BRD.
Press SW4 on the EV kit to reset the µC and the
MAX3100 to its initial power-on-reset (POR) state.
See Tables 1, 2, and 3 for a description of the EV kit
jumpers and switch settings.
MAX3100 Baud Rate Generation
Jumper and Switch Settings
Hardware Reset
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