MAX11300 Datasheet, PDF (28/54 Pages) Maxim Integrated Products – Up to 20 General-Purpose Digital I/Os

MAX11300
PIXI, 20-Port Programmable Mixed-Signal I/O with
12-Bit ADC, 12-Bit DAC, Analog Switches, and GPIO
Unidirectional and Bidirectional
Level Translator Operations
By combining GPI- and GPO-configured ports, unidirection-
al level translator paths can be formed. The signaling at the
input of the path can be different from the signaling at the
end (Figure 10). For example, a unidirectional path could
convert a signal from 1.8V logic level to 3.3V logic level.
The unidirectional path configuration allows for the trans-
mission of signals received on a GPI-configured port to
one or more GPO-configured ports.
Pairs of adjacent PIXI ports can also form bidirectional
level translator paths that are targeted to operate with
open-drain drivers (Figure 11). When used as a bidi-
rectional level translator, the pair of PIXI ports must be
accompanied with external pullup resistors to meet proper
logic levels.
ANY
PORT
SERIAL
INTERFACE
SEQUENCER
DAC
GPI
DAC_REF
INTERNAL OR
EXTERNAL FOR ALL
PORTS
DIGITAL
CORE
DAC
SEQUENCER
SPI
SCALING
BLOCK
GPO
ANY OTHER
PORT
INT
Figure 10. Unidirectional Level Translator Path Mode
CHIP1 WITH VDD1
LOGIC LEVEL
LOGIC
CONTROLLER
VDD1
VDD2
MAX11300
PIXI[i]
PIXI[i+1]
CHIP2 WITH VDD2
LOGIC LEVEL
LOGIC
CONTROLLER
Figure 11. Bidirectional Level Translation Application Diagram
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