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ADM1021AARQ-REEL bảng dữ liệu(PDF) 10 Page - Analog Devices

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ADM1021A
–10–
REV. D
This is illustrated in Figure 3. The device address is sent over
the bus followed by R/
W set to 0. This is followed by two data
bytes. The first data byte is the address of the internal data reg-
ister to be written to, which is stored in the Address Pointer
Register. The second data byte is the data to be written to the
internal data register.
When reading data from a register there are two possibilities:
1. If the ADM1021A’s Address Pointer Register value is unknown
or not the desired value, it is first necessary to set it to the
correct value before data can be read from the desired data
register. This is done by performing a write to the ADM1021A
as before, but only the data byte containing the register read
address is sent, as data is not to be written to the register.
This is shown in Figure 4.
A read operation is then performed consisting of the serial
bus address, R/
W bit set to 1, followed by the data byte read
from the data register. This is shown in Figure 5.
2. If the Address Pointer Register is known to be already at the
desired address, data can be read from the corresponding data
register without first writing to the Address Pointer Register,
so Figure 4 can be omitted.
NOTES
1. Although it is possible to read a data byte from a data register
without first writing to the Address Pointer Register, if the
Address Pointer Register is already at the correct value, it is
not possible to write data to a register without writing to the
Address Pointer Register, because the first data byte of a
write is always written to the Address Pointer Register.
2. Remember that the ADM1021A registers have different
addresses for read and write operations. The write address
of a register must be written to the Address Pointer if data
is to be written to that register, but it is not possible to read
data from that address. The read address of a register must
be written to the Address Pointer before data can be read
from that register.
ALERT OUTPUT
The
ALERT output goes low whenever an out-of-limit mea-
surement is detected, or if the remote temperature sensor is
open-circuit. It is an open-drain and requires a 10 k
Ω pull-up to
VDD. Several ALERT outputs can be wire-ANDed together, so
that the common line will go low if one or more of the
ALERT
outputs goes low.
The
ALERT output can be used as an interrupt signal to a pro-
cessor, or it may be used as an
SMBALERT. Slave devices on
the SMBus can normally not signal to the master that they want
to talk, but the
SMBALERT function allows them to do so.
One or more
ALERT outputs are connected to a common
SMBALERT line connected to the master. When the SMBALERT
line is pulled low by one of the devices, the following procedure
occurs as illustrated in Figure 6.
MASTER
RECEIVES
SMBALERT
MASTER SENDS
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
NO
ACK
START
ALERT RESPONSE ADDRESS
RD
ACK
DEVICE ADDRESS
STOP
Figure 6. Use of
SMBALERT
1.
SMBALERT is pulled low.
2. Master initiates a read operation and sends the Alert Response
Address (ARA = 0001 100). This is a general call address
that must not be used as a specific device address.
3. The device whose
ALERT output is low responds to the Alert
Response Address and the master reads its device address. The
address of the device is now known and it can be interrogated
in the usual way.
4. If more than one device’s
ALERT output is low, the one with
the lowest device address will have priority, in accordance with
normal SMBus arbitration.
5. Once the ADM1021A has responded to the Alert Response
Address, it will reset its
ALERT output, provided that the
error condition that caused the
ALERT no longer exists. If
the
SMBALERT line remains low, the master will send the
ARA again, and so on until all devices whose
ALERT outputs
were low have responded.
LOW POWER STANDBY MODES
The ADM1021A can be put into a low power standby mode
using hardware or software, that is, by taking the
STBY input
low, or by setting Bit 6 of the Configuration Register. When
STBY is high, or Bit 6 is low, the ADM1021A operates normally.
When
STBY is pulled low or Bit 6 is high, the ADC is inhibited,
so any conversion in progress is terminated without writing the
result to the corresponding value register.
The SMBus is still enabled. Power consumption in the standby
mode is reduced to less than 10
µA if there is no SMBus activity,
or 100
µA if there are clock and data signals on the bus.
These two modes are similar but not identical. When
STBY is
low, conversions are completely inhibited. When Bit 6 is set but
STBY is high, a one-shot conversion of both channels can be initi-
ated by writing XXh to the One-Shot Register (address 0Fh).
SENSOR FAULT DETECTION
The ADM1021A has a fault detector at the D+ input that detects
if the external sensor diode is open-circuit. This is a simple
voltage comparator that trips if the voltage at D+ exceeds
VCC – 1V (typical). The output of this comparator is checked
when a conversion is initiated, and sets Bit 2 of the Status Register
if a fault is detected.
If the remote sensor voltage falls below the normal measuring
range, for example due to the diode being short-circuited, the
ADC will output –128
°C (1000 0000). Since the normal operat-
ing temperature range of the device only extends down to 0
°C,
this output code will never be seen in normal operation, so it
can be interpreted as a fault condition.
In this respect, the ADM1021A differs from and improves upon
competitive devices that output zero if the external sensor goes
short-circuit. These devices can misinterpret a genuine 0
°C
measurement as a fault condition.
If the external diode channel is not being used and is shorted
out, the resulting
ALERT may be cleared by writing 80h (–128
°C)
to the low limit register.


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