AD7280AWBSTZ Analog Devices Inc, AD7280AWBSTZ Datasheet - Page 41

• 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 4: Convert and Read a Single Voltage
or Auxiliary ADC Input Result from One Part
In this example, it is assumed that all AD7280As in the daisy
chain have been initialized to their correct device addresses.
1.
2.
3.
Table 26. Example 4: Converting and Reading a Single Voltage or Auxiliary ADC Result from One AD7280A Device
Write Command
Write 1
Write 2
Write 3
Write 4
Write 5
Write 6
The register address corresponding to the voltage or
auxiliary ADC input result to be read should be written to
the read register of the part to be read (see Table 13 for
register addresses). In this example, the Cell Voltage 6
register result is read from Device 3 in the stack. The 32-bit
write command is 0xC382865A (see Table 26, Write 1).
Set Bits[D13:D12] of the control register to 1 on all parts.
This setting turns off the read operation on all parts. The
32-bit write command is 0x01B617EA (see Table 26,
Write 2).
Set Bits[D13:D12] of the control register of the part to be
read from such that the required voltage is read back. With
the exception of a self-test conversion, it is not possible to
convert on a single channel; six, nine, or 12 conversions must
be completed. This example reads a voltage conversion from
Device 3 in the stack; therefore, Bit D14 and Bit D12 of the
control register should be set to 0, and Bit D15 and Bit D13
should be set to 1 on Device 3. The 32-bit write command
is 0xC1B400FA (see Table 26, Write 3).
Device Address
11000
00000
11000
11000
00000
11111
Register Address
011100
001101
001101
011101
011101
000000
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Data
00010100
10110000
10100000
00000010
00000001
00000000
4.
5.
6.
7.
8.
Write All
0
1
0
0
1
0
Program the CNVST control register to 0x02 on Device 3
to allow conversions to be initiated using the CNVST pin
on that part. The 32-bit write command is 0xC3A0417A
(see
Initiate conversions through the falling edge of CNVST .
Allow sufficient time for all conversions to be completed
plus t
Program the CNVST control register to gate the CNVST
signal on all parts. The 32-bit write command is
0x03A0340A (see
unintentional conversions from being initiated by noise or
glitches on the
chip output registers of all devices in the daisy chain.
Apply a CS low pulse that frames 32 SCLKs to read back
the desired voltage or auxiliary ADC result. This frame
should simultaneously write the 32-bit command
0xF800030A, as described in the
(see
Note that when reading from a single device in a stack of
AD7280As, the SCLK frequency must be lower than 1 MHz
to read back the register data from parts higher in the chain
than the master device.
Table 26
Table 26
WAIT
.
D11
0
0
0
0
0
0
, Write 4).
, Write 6).
CNVST pin. This write also updates the on-
Table 26
8-Bit CRC
11001011
11111101
00011111
10000111
10000001
01100001
, Write 5). This write prevents
D2 to D0
010
010
010
010
010
010
Serial Interface
AD7280A
32-Bit Write
Command
0xC382865A
0x01B617EA
0xC1B400FA
0xC3A0417A
0x03A0340A
0xF800030A
section