Rainbow-electronics MAX1329 Manual de usuario descargar pdf (Pagina 44)

MAX1329/MAX1330

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

Reference, Voltage Monitors, and Temp Sensor

44 ______________________________________________________________________________________

ADC Data Register

The ADC Data register contains the result from the most

recently completed analog-to-digital conversion. The

12-bit result is stored in the ADCDATA<11:0> bits. The

data format is binary for unipolar mode and two’s com-

plement for bipolar mode. The ADC Data register con-

tents are the same as the ADC FIFO contents at the last

written address, unless writes to the ADC FIFO have

been inhibited.

ADC FIFO Register

The ADC FIFO register contents are different for write

and read modes. In write mode, the ADC FIFO register

sets the working depth of the FIFO and the address that

generates an interrupt. In read mode, the ADC FIFO

Write Format

A serial interface write to the ADC FIFO register moves

the FIFO write and read pointers to address 0.

AFFD<3:0>: ADC FIFO Depth bits (default = 0000).

AFFD<3:0> sets the working depth of the FIFO (see

Table 10). If set to a depth of zero, the ADC FIFO is dis-

abled and writes to the AFF (ADC FIFO Full) bit in the

Status register are also disabled. AFFD<3:0> are write-

only bits.

AFFI<3:0>: ADC FIFO Interrupt Address bits (default =

0000). AFFI<3:0> sets the FIFO address. After each

successful ADC conversion, the conversion results are

transferred from the ADC Data register to the FIFO

location indicated by the FIFO write pointer, and the

FIFO write pointer is incremented. When the FIFO write

pointer exceeds the value in AFFI<3:0>, the AFF bit in

the Status register (Table 11) is asserted. Set the

AFFI<3:0> value equal to or less than the AFFD<3:0>

value. If set to a value greater than AFFD<3:0>,

AFFI<3:0> is forced to the AFFD<3:0> value. If

AFFD<3:0> is set to 0000 (depth of zero), the ADC

FIFO is disabled and writes to the AFF bit are also dis-

abled. AFFI<3:0> are write-only bits.

MSB LSB

NAME AFFD3 AFFD2 AFFD1 AFFD0 AFFI3 AFFI2 AFFI1 AFFI0

DEFAULT 00000000

MSB

NAME ADCDATA11 ADCDATA10 ADCDATA9 ADCDATA8 ADCDATA7 ADCDATA6 ADCDATA5 ADCDATA4

DEFAULT 00000000

LSB

NAME ADCDATA3 ADCDATA2 ADCDATA1 ADCDATA0 X X X X

DEFAULT 0000XXXX

X = Don’t care.

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 77 78

MAX1329/MAX1330 1

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Rainbow-electronics MAX1329 Manual de usuario Pagina 44

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