AD7294 datasheet(30/48 Pages) AD

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Data Sheet

AD7294

Rev. I | Page 29 of 47

ADC Channel Allocation

The three channel address bits indicate which channel the result

in the result register represents. Table 13 details the channel ID bits

(S.E. indicates single-ended and DIFF indicates differential).

Table 13. ADC Channel Allocation

Function

Channel ID

CHID2

CHID1

CHID0

VIN0 (S.E.) or

VIN0 − VIN1 (DIFF)

VIN1 (S.E.) or

VIN1 − VIN0 (DIFF)

VIN2 (S.E.) or

VIN2 − VIN3 (DIFF)

VIN3 (S.E.) or

VIN3 − VIN2 (DIFF)

ISENSE1

ISENSE2

TSENSE1

TSENSE2

TSENSE1, TSENSE2 RESULT REGISTERS (0X02 AND

0X03)

The MSB, D15 is the alert_flag bit whereas Bit D14 to Bit D12

contain the three ADC channel allocation bits. D11 is reserved

for flagging diode open circuits. The temperature reading from

the ADC is stored in an 11-bit twos complement format, D10 to

D0 (see Table 14 and Table 15). Conversions take place approx-

imately every 5 ms.

Table 14. TSENSE Register (First Read)

MSB

LSB

D15

D14

D13

D12

D11

D10

Alert_Flag

CHID2

CHID1

CHID0

B11

B10

Table 15. Register (Second Read)

MSB

LSB

TSENSEINT RESULT REGISTER (0X04)

The TSENSEINT register is a 16-bit read-only register used to

store the ADC data generated from the internal temperature

sensor. Similar to the TSENSE1 and TSENSE2 result registers, this

bit twos complement format, D10 to D0, and uses the MSB as a

general alert flag. Bits[D14:D11] are not used and are set to

zero. Conversions take place approximately every 5 ms. The

temperature data format in Table 16 also applies to the internal

temperature sensor data.

Temperature Value Format

The temperature reading from the ADC is stored in an 11-bit

twos complement format, D10 to D0, to accommodate both

positive and negative temperature measurements. The temper-

ature data format is provided in Table 16.

Table 16. TSENSE Data Format

Input

D10 (MSB)

D0 (LSB)

Value (°C)

−256

+128

+64

+32

+16

+0.5

+0.25

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