MAX1329 Datasheet, PDF (64/78 Pages) Maxim Integrated Products – 12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs, Reference, Voltage Monitors, and Temp Sensor

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,
Reference, Voltage Monitors, and Temp Sensor
Communication with a Peripheral Device
Powered by the MAX1329/MAX1330
The circuit in Figure 27 shows the MAX1329/MAX1330
providing an interface between a µC and a peripheral
device powered by different supply voltages. This elimi-
nates the need for external level-translation circuitry due
to the different supply voltages. The internal charge
pump boosts the µC supply voltage (DV_DD) to the periph-
eral device supply voltage (AV_DD). See the APIO Control
and APIO Setup registers to program APIO2–APIO4 as
DIN, SCLK, and CS outputs to the peripheral device,
respectively, and APIO1 as the DOUT input from the
peripheral device. The digital inputs at DIN, SCLK, and
CS are level-translated from DV_DD to AV_DD and output at
the configured APIO2, APIO3, and APIO4 outputs. The
digital output at DOUT is level-translated from AV_DD to
DV_DD from the configured APIO1 input.
MAX1329
MAX1330
CLKIO
CS
SCLK
DIN
DOUT
RST1
RST2
DPIO1
DPIO2
32.768kHz
XIN
XOUT
µC
HCLKIN
OUTPUT
SCK
MOSI
MISO
RESET
INTERRUPT
INTERRUPT
INTERRUPT
POWER
SUPPLY
EXTERNAL 1.8V TO 3.6V
C_DVDD
DV_DD
DV_DD
OUTPUT
µC
SCK
MOSI
MISO
DGND
CS
SCLK
DIN
DOUT
DGND
Figure 26. Digital-Interface Connections
3.0V/4.0V/5.0V
C_AVDD
C_FLY
C1A
C1B
AV_DD
MAX1329
MAX1330
APIO4
APIO3
APIO2
AGND
APIO1
AV_DD
CS
PERIPHERAL
DEVICE
SCLK
DIN
DOUT
AGND
Figure 27. Communication with a Peripheral Device Powered by the MAX1329/MAX1330
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