MAX191EVKIT-DIP Maxim Integrated, MAX191EVKIT-DIP Datasheet - Page 3

• Manufacturer Part Number: MAX191EVKIT-DIP
• Description: Data Conversion IC Development Tools Evaluation System/Evaluation Kit for the MAX191
• Manufacturer: Maxim Integrated
• Series: MAX191r

Specifications of MAX191EVKIT-DIP

• Interface Type: Parallel, QSPI, Serial (SPI, Microwire)

Without the 80C32 module, the MAX191 evaluation
board can perform a limited evaluation of the MAX191
using external signals. To evaluate the device in the
serial-interface mode, refer to the timing diagram in
Figure 10b of the MAX191 data sheet and connect the
board as follows:
1) Connect a +5V power supply to the marked pads
2) Ground the PAR pin on the 10-pin header to set the
3) Connect the clock signal (0.1MHz to 1.6MHz) to the
4) Connect the chip-select signal
5) Connect an oscilloscope to the serial data pin
6) The MAX191 V
7) Leaving the BIP pin of the 10-pin header open will
An ICL7660 +5V to -5V converter and a DG413 analog
switch are the means for switching the MAX191’s V
voltage between ground and -5V. The analog switch is
not required for most application circuits because the
V
MAX191 requires a negative supply only if the input
voltage is expected to go below ground.
The ICL7660 provides a -5V source with minimal addi-
tional circuitry. The ICL7660 converter circuit on the
MAX191 EV kit is the standard application circuit for
+5V to -5V conversions. Its 10mA output capacity is
much more than the 100µA needed for the MAX191 EV
kit. The additional current is available for user circuits in
the prototyping area. For applications where the
MAX191 is the only load, the 10µF capacitors may be
reduced to 0.1µF.
_______________Detailed Description
SS
(GND and +5V) on the board.
chip-select pin (SCS) on the 10-pin header.
(SDAT) on the 10-pin header.
grounding the V
header. The V
open.
operate the MAX191 in bipolar mode. Grounding
the pin will change the mode to unipolar.
MAX191 in the serial-interface mode.
SCK pin on the 10-pin header.
voltage will be fixed at either -5V or ground. The
MAX191 Evaluation System/Evaluation Kit
SS
SS
_______________________________________________________________________________________
SS
voltage is 0V when this pin is left
voltage can be changed to -5V by
select pin (VSEL) on the 10-pin
EV Kit Quick Start
(CS) to the serial
V
SS
Circuit
SS
Table 1. Port 1 Bit Functions
Communications between the 80C32 module and the
MAX191 can be in serial or parallel mode. A 74HC157
multiplexer is used to toggle the MAX191 chip-select
signal (CS) between the serial chip select (SCS, P1.7)
and a decoded address signal (CS0). In either mode,
the MAX191 BIP, PAR, and HBEN pins are controlled
by the 80C32 port 1 programmable bits. In serial mode,
port 1 also toggles the clock pin and receives the serial
data. Table 1 lists the functions of the port 1 bits.
The MAX191 EV kit is configured to operate with the
MAX191’s internal 4.096V reference, using external ref-
erence compensation mode (PD pin floating—see
MAX191 data sheet). Access to the PD pin is provided
via connector location JJ1.
To evaluate the MAX191 in internal reference compen-
sation mode, remove the reference compensation
capacitors C7 and C11, and force the PD pin high at
location JJ1.
To place the MAX191 in its low-current power-down
mode, connect PD to ground using JJ1.
A jumper position (JJ2) included on the MAX191 EV kit
printed circuit board provides a convenient place to
monitor the MAX191’s V
current meter, cut the trace across the position marked
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
BIT
NAME
VSEL
SCK
HBE
SRD
BSY
PAR
SCS
BIP
Clock signal for serial mode
Selects 0V or -5V for MAX191's V
Low = 0V, High = -5
The MAX191 BUSY output
The MAX191 PARallel mode select pin.
Also controls the 74HCT157 multiplexer.
The MAX191 BIPolar pin
The MAX191 HBEN (high-byte enable) pin
The MAX191 D7/SDATA (serial data) pin
Serial mode chip-select signal
Monitoring the MAX191
DD
supply current. To insert a
Reference Circuit
Interface Modes
FUNCTION
Supply Current
SS
pin:
3