MCP37231 datasheet(76/144 Pages) MICROCHIP

76 / 144 page

MCP37231/21-200 AND MCP37D31/21-200

DS20005322D-page 76

 2014-2016 Microchip Technology Inc.

4.15

AutoSync Mode: Synchronizing

Multiple ADCs at the same Clock

using Master and Slave

Configuration

AutoSync allows multiple devices to sample input syn-

chronously at the same clock, and output the conver-

sion data at the same time if they are using the same

digital signal post-processing. Figure 4-27 shows the

system configuration using the AutoSync feature.

Three examples with timing diagram are shown in

Figure 2-9

– Figure 2-11.

Once the devices are synchronized, each device

performs internal calibration (

TPCAL) before sending out

valid data output. Any ADC data output before the

calibration is complete should be ignored.

Note that the calibration time varies slightly from

device to device, and the internal calibration status can

be monitored using the CAL pin or ADC_CAL_STAT bit

in the Register Address 0xC0.

The valid synchronized output is available when all

devices complete their own internal calibration. For

this reason, the user has two options for the

synchronized output: (a) monitor the calibration status

of individual devices and wait until all devices

complete calibrations or (b) use an external AND gate

as shown in Figure 4-26. Master and all Slave devices

are synchronized when the AND gate output toggles

to “High”.

The AutoSync feature can be used with the following

steps:

• Master device is selected by setting SLAVE pin to

“GND”: SYNC pin becomes output pin.

• Slave device is selected by setting SLAVE pin to

“High” (or tie to DVDD): SYNC pin becomes input

pin.

• Feed the Master’s SYNC pin output to Slave’s

SYNC pin.

• Use AutoSync mode using (a) Power-On Reset

(Figure 2-9), (b) RESET Pin (Figure 2-10), or (c)

SOFT RESET bit (Figure 2-11).

MCP37231 Datasheet(PDF) 76 Page - Microchip Technology

MCP37231 Datasheet(HTML) 76 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL