Rainbow-electronics MAX1329 Bedienungsanleitung PDF herunterladen (Seite 64)

MAX1329/MAX1330

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,

Reference, Voltage Monitors, and Temp Sensor

64 ______________________________________________________________________________________

Communication with a Peripheral Device

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

) to the periph-

eral device supply voltage (AV

). 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

to AV

and output at

the configured APIO2, APIO3, and APIO4 outputs. The

digital output at DOUT is level-translated from AV

from the configured APIO1 input.

µC

DPIO2

OUTPUT

SCK

SCLK

MOSIDIN

MISO

DOUT

INTERRUPT

DPIO1

HCLKIN

CLKIO

32.768kHz

XOUT

XIN

INTERRUPT

MAX1329

MAX1330

RST1

RST2

RESET

Figure 26. Digital-Interface Connections

µC

APIO4

OUTPUT

SCK

SCLK

MOSI

DIN

MISO

DOUT

APIO3

APIO2

APIO1

PERIPHERAL

DEVICE

DIN

DOUT

SCLK

AGND

DGND

AGND

DGND

C1A C1B

FLY

EXTERNAL 1.8V TO 3.6V

3.0V/4.0V/5.0V

POWER

SUPPLY

AVDD

DVDD

MAX1329

MAX1330

Figure 27. Communication with a Peripheral Device Powered by the MAX1329/MAX1330

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 77 78

MAX1329/MAX1330 1

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