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MAX11312 データシート(PDF) 45 Page - Maxim Integrated Products

部品番号 MAX11312
部品情報  PIXI, 12-Port Programmable Mixed-Signal I/O with 12-Bit ADC, 12-Bit DAC, Analog Switches, and GPIO
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メーカー  MAXIM [Maxim Integrated Products]
ホームページ  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX11312 データシート(HTML) 45 Page - Maxim Integrated Products

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Port Configuration Registers (Read/Write) (continued)
MAX11312
PIXI, 12-Port Programmable Mixed-Signal I/O with
12-Bit ADC, 12-Bit DAC, Analog Switches, and GPIO
www.maximintegrated.com
Maxim Integrated │ 45
BIT
FIELD NAME
DESCRIPTION
0011:
Mode 3 - Register-driven digital output with DAC-controlled level, GPO (Figure 8)
The port is configured as a GPO driven by the corresponding GPODAT register bit.
The logic one level is set by the DAC data register of that port.
The port’s DAC data register needs to be set first. It may require up to 1ms for the
port to be ready to produce the desired logic one level. At that point, the port can
be set in mode 3. The logic level at the port is then controlled by the corresponding
GPODAT register bit.
0100:
Mode 4 - Unidirectional path output with DAC-controlled level, GPO (Figure 9)
The port is configured as a GPO forming the output of a unidirectional level
translator path. The input port of that path is specified by the functional parameter,
ASSOCIATED PORT, and that port must be separately configured in GPI mode. The
port’s DAC data register defines the logic one level. The data received by the GPI-
configured port is transmitted by this port configured in mode 4.
The data from the associated GPI-configured port can be inverted by asserting the
functional parameter INV.
Multiple ports configured in mode 4 can refer to the same GPI-configured port
through the functional parameter, ASSOCIATED PORT. Therefore, one GPI-
configured port can transmit its data to multiple ports configured in mode 4.
To avoid false interrupts and unexpected activity at the port configured in mode 4,
the GPI port must be configured before this port is configured in mode 4.
Functional parameters to be set: INV, ASSOCIATED PORT
0101:
Mode 5 - Analog output for DAC (Figure 5)
The port’s DAC data register must be set for the desired voltage at the port. It may
take up to 1ms for the port to reflect the data written in the DAC data register.
Functional parameters to be set: RANGE (codes 001, 010, and 011 apply to this
mode).
0110:
Mode 6 - Analog output for DAC with ADC monitoring (Figure 6)
In addition to the functionality of mode 5, the port is sampled by the ADC. The result
of the ADC conversion is stored in the port’s ADC data register. The host can access
that register to monitor the voltage at the port.
When the ADC input voltage range is set from 0V to 2.5V, (RANGE = 100 or 110), the
DAC data register value must be limited to the range of values corresponding to 0V
to 2.5V at the port. Internally, the DAC data register value is clipped, so that the PIXI
port voltage is contained within a range from 0V to 5V to prevent device damage.
Functional parameters to be set: AVR, RANGE
0111:
Mode 7 - Positive analog input to single-ended ADC (Figure 2)
The port is configured as a single-ended ADC input.
Functional parameters to be set: RANGE, # OF SAMPLES
1000:
Mode 8 - Positive analog input to differential ADC (Figure 3)
The port is configured as a differential ADC positive input.
Functional parameters to be set: RANGE, # OF SAMPLES, ASSOCIATED PORT


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