Rainbow-electronics MAX1299 Manual de usuario descargar pdf (Pagina 13)

13 f

CLKs

WARMUP

44 f

CLKs

CONVERTION

CYCLES 2–12

REFERENCE

SAMPLING

3 f

CLKs

SUBTRACTION

AND WRITE TO

OUTPUT REGISTER

48 f

CLKs

CONVERTION CYCLES 1–12

13 f

CLKs

WARMUP

INPUT

ACQUISITION

INPUT

ACQUISITION

SSTRB

FCLK

4 f

CLKs

CONVERSION CYCLE 1

FIRST CONVERSION

SECOND CONVERSION

MAX1298/MAX1299

12-Bit Serial-Output Temperature Sensors

with 5-Channel ADC

______________________________________________________________________________________ 13

input sampling capacitance of the ADC (4pF). Source

impedances below 100kΩ have no significant effect on

MAX1298/MAX1299 AC performance.

Analog Input Protection

Internal protection diodes clamp the analog inputs to

and GND, so channels can swing within GND -

0.3V and V

+ 0.3V without damage. However, for

accurate conversions, the inputs should not extend

beyond the supply rails.

If an off-channel analog input extends beyond the

supply rails, limit the input current to 2mA.

Serial Digital Interface

The MAX1298/MAX1299 feature a serial interface that is

fully compatible with SPI, QSPI, and MICROWIRE

devices. For SPI/QSPI, ensure that the CPU serial inter-

face runs in master mode so it generates the serial

clock signal. Select a 2.5MHz clock frequency or less,

and set zero values for clock polarity (CPOL) and

phase (CPHA) in the µP control registers. Figure 4

shows detailed serial interface timing information. See

Tables 2–5 for programming information.

13 f

CLKs

WARMUP

3 f

CLKs

WRITE TO OUTPUT

INPUT

ACQUISITION

CLKs

SSTRB

FCLK

REF

ACQUISITION 1

REF

ACQUISITION 2

44 f

CLKs

CONVERSION CYCLE 1

CONVERSION CYCLES 2–12

REFERENCE SAMPLING

Figure 3b. Temperature Conversion Timing Diagram

Figure 3a. Voltage Conversion Timing Diagram

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 19 20

MAX1298/MAX1299 1

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