MAX11300 Datasheet, PDF (29/54 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
Internally or Externally Controlled
Analog Switch Operation
Two adjacent PIXI ports can form a 60Ω analog switch
that is controlled by two different configurations. In one
configuration, the switch is dynamically controlled by any
other GPI-configured PIXI port, as illustrated in Figure
12. The signal applied to that GPI-configured port can be
inverted.
In the other configuration, the switch is programmed to be
permanently “ON” by configuring the corresponding PIXI
port. To turn the switch “OFF”, the host must set that PIXI
port in high-impedance configuration.
Power-Supply Brownout Detection
The MAX11300 features a brownout detection circuit that
monitors AVDDIO and AVDD pins. When AVDDIO goes
below approximately 4.0V, an interrupt is registered, and
the interrupt port is asserted if not masked. When AVDD
goes below approximately 4.0V, the device resets.
SPI Operations
The MAX11300 SPI interface complies with the timing
of Mode 0, as illustrated in Figure 13. The MAX11300
samples incoming data on the rising edge of SCLK and
releases outgoing data on the falling edge of SCLK.
PIXI PORT[i]
Figure 12. PIXI Ports as a Controllable Analog Switch
GPI ANY OTHER PORT
PIXI PORT[i+1]
SCLK
DIN
B23
B22
B21
DOUT
CS
B23
B22
B21
Figure 13. SPI Timing (Mode 0)
B3
B2
B1
B0
B3
B2
B1
B0
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