AD7280AWBSTZ Analog Devices Inc, AD7280AWBSTZ Datasheet - Page 39

• Manufacturer Part Number: AD7280AWBSTZ
• Description: IC BATT MON LI-ION AUTO 48LQFP
• Manufacturer: Analog Devices Inc
• Series: -r

Specifications of AD7280AWBSTZ

• Function: Battery Monitor, Over/Under Voltage Protection
• Battery Chemistry: Lithium-Ion (Li-Ion)
• Voltage - Supply: 8 V ~ 30 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Example 1: Initialize All Parts in a Daisy Chain on Initial
Power-Up and When Coming Out of Power-Down
Example 1 shows a typical device initialization routine.
1.
2.
3.
Table 23. Example 1: Initializing All AD7280A Devices in a Daisy Chain
Write Command
Write 1
Write 2
Write 3
Table 24. Example 2: Converting and Reading All Voltages and All Auxiliary ADC Inputs from All AD7280A Devices
Write Command
Write 1
Write 2
Write 3
Write 4
To initialize all device addresses, set Bit D2 and Bit D0
of the control register to 1, and set Bit D1 of the control
register to 0 on all parts in the chain. The 32-bit write
command is 0x01C2B6E2 (see Table 23, Write 1).
Write the register address corresponding to the lower byte
of the control register to the read register on all parts. The
32-bit write command is 0x038716CA (see Table 23, Write 2).
Apply a CS low pulse that frames 32 SCLKs for each device
in the chain to be read back. All conversion readbacks
should simultaneously write the 32-bit command
0xF800030A, as described in the
(see
AD7280As in the chain have received and locked their
unique device addresses. Confirm that all device addresses
are in sequence.
Table 23
, Write 3). This read is used to verify that all
Device Address
Device Address
00000
00000
00000
11111
00000
00000
11111
Serial Interface
Register Address
001110
011100
000000
Register Address
011100
001101
011101
000000
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Data
00010101
00111000
00000000
Data
00000000
00000000
00000010
00000000
Example 2: Convert and Read All Parts, All Voltages,
and All Auxiliary ADC Inputs
In this example, it is assumed that all AD7280As in the daisy
chain have been initialized to their correct device addresses.
1.
2.
3.
4.
5.
Write All
1
1
0
Write All
1
1
1
0
Write Register Address 0x00 to the read register on all
parts. A device address of 0x00 is used when computing
the CRC for commands to write to all parts. The 32-bit
write command is 0x38011CA (see Table 24, Write 1).
Note that 0x00 is the default value of the read register on
power-up and after a software reset; therefore, this write
operation may not be necessary.
Set Bits[D15:D12] of the control register to 0 on all parts.
The 32-bit write command is 0x01A0131A (see Table 24,
Write 2).
Note that this is the default value of Bits[D15:D12] of the
control register on power-up and after a software reset;
therefore, this write operation may not be necessary.
Program the CNVST control register to 0x02 on all parts
to allow conversions to be initiated using the CNVST pin.
The 32-bit write command is 0x03A0546A (see
Write 3).
Initiate conversions through the falling edge of CNVST .
Allow sufficient time for all conversions to be completed
plus t
apply a CS low pulse that frames 32 SCLKs for each conver-
sion result to be read back. The 32-bit write command is
0xF800030A, as described in the
(see
Table 24
WAIT
. Following the completion of all conversions,
D11
0
0
0
0
D11
0
0
0
, Write 4).
8-Bit CRC
11011100
11011001
01100001
8-Bit CRC
00111001
01100011
10000101
01100001
D2 to D0
010
010
010
010
D2 to D0
010
010
010
Serial Interface
AD7280A
32-Bit Write
Command
0x038011CA
0x01A0131A
0x03A0546A
0xF800030A
32-Bit Write
Command
0x01C2B6E2
0x038716CA
0xF800030A
Table 24
section
,