AD7294BSUZ Analog Devices Inc, AD7294BSUZ Datasheet - Page 37

• Manufacturer Part Number: AD7294BSUZ
• Description: IC ADC 12BIT W/DAC/TEMP 64TQFP
• Manufacturer: Analog Devices Inc
• Type: ADC, DACr

Specifications of AD7294BSUZ

• Resolution (bits): 12 b
• Data Interface: Serial
• Sampling Rate (per Second): 22.22k
• Voltage Supply Source: Analog and Digital
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -55°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Sampling Rate: 22.22kSPS
• Input Channel Type: Differential, Single Ended
• Supply Voltage Range - Digital: 4.5V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Writing Two Bytes of Data to a 16-Bit Register
The limit and hysteresis registers (0x0B to 0x25), the result
registers (0x01 to 0x04), and the configuration register (0x09)
are 16-bit registers; therefore, two bytes of data are required to
write a value to any one of these registers. Writing two bytes of
data to one of these registers consists of the following sequence:
1.
2.
3.
4.
5.
6.
7.
8.
9.
The master device asserts a start condition on SDA.
The master sends the 7-bit slave address followed by the
write bit (low).
The addressed slave device asserts an acknowledge on SDA.
The master sends a register address. The slave asserts an
acknowledge on SDA.
The master sends the first data byte (most significant).
The slave asserts an acknowledge on SDA.
The master sends the second data byte (least significant).
The slave asserts an acknowledge on SDA.
The master asserts a stop condition on SDA to end the
transaction.
...
S
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
DATA<15:8>
SLAVE ADDRESS
S
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
A
SLAVE ADDRESS
S = START CONDITION
SR = REPEATED START
P = STOP CONDITION
A = ACKNOWLEDGE
A = NOT ACKNOWLEDGE
0
DATA<7:0>
A
POINT TO PD REG (0x0A)
S = START CONDITION
SR = REPEATED START
P = STOP CONDITION
A = ACKNOWLEDGE
A = NOT ACKNOWLEDGE
0
A
Figure 52. Writing Two Bytes of Data to a 16-Bit Register
A
P
Figure 53. Writing to Multiple Registers
REG POINTER
Rev. F | Page 37 of 48
A
A
Writing to Multiple Registers
Writing to multiple address registers consists of the following:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. The master sends the second data byte.
11. The slave asserts an acknowledge on SDA.
12. The master asserts a stop condition on SDA to end the
The previous examples detail writing to two registers only (the
Alert Status Register A and the configuration register).
However, the AD7294 can read from multiple registers in one
write operation as shown in Figure 53.
DATA<7:0>
DATA<15:8>
The master device asserts a start condition on SDA.
The master sends the 7-bit slave address followed by the
write bit (low).
The addressed slave device (AD7294) asserts an
acknowledge on SDA.
The master sends a register address, for example the Alert
Status Register A register address. The slave asserts an
acknowledge on SDA.
The master sends the data byte.
The slave asserts an acknowledge on SDA.
The master sends a second register address, for example
the configuration register. The slave asserts an
acknowledge on SDA.
The master sends the first data byte.
The slave asserts an acknowledge on SDA.
transaction.
A
A
POINT TO CONFIG REG (0x09)
DATA<7:0>
A
P
A
AD7294
...