ADM1030
http://onsemi.com
9
Figure 16. Writing to the Address Pointer Register Only
0
SCL
SDA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1030
START BY
MASTER
1
9
1
ACK. BY
ADM1030
9
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
R/W
Figure 17. Reading Data from a Previously Selected Register
SCL
SDA
D7
D6
D5
D4
D3
D2
D1
D0
NO ACK.
BY MASTER
START BY
MASTER
9
1
ACK. BY
ADM1030
9
STOP BY
MASTER
0
1
0
1
1
A1
A0
1
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADM1030
R/W
Alert Response Address
Alert Response Address (ARA) is a feature of SMBus
devices that allows an interrupting device to identify itself
to the host when multiple devices exist on the same bus.
The INT
output can be used as an interrupt output or can
be used as an SMBALERT
. One or more INT
outputs can be
connected to a common SMBALERT
line connected to the
master. If a devices INT
line goes low, the following
procedure occurs:
1. SMBALERT
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 INT
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 can be interrogated in the usual
way.
4. If more than one devices INT
output is low, the
one with the lowest device address will have
priority, in accordance with normal SMBus
arbitration.
5. Once the ADM1030 has responded to the Alert
Response Address, it will reset its INT
output;
however, if the error condition that caused the
interrupt persists, INT
will be reasserted on the
next monitoring cycle.
Temperature Measurement System
Internal Temperature Measurement
The ADM1030 contains an on-chip bandgap temperature
sensor. The on-chip ADC performs conversions on the
output of this sensor and outputs the temperature data in
10-bit twos complement format. The resolution of the local
temperature sensor is 0.25癈. The format of the temperature
data is shown in Table 6.
External Temperature Measurement
The ADM1030 can measure the temperature of an
external diode sensor or diode-connected transistor,
connected to Pins 9 and 10.
These pins are a dedicated temperature input channel. The
function of Pin 7 is as a THERM
input/output and is used to
flag overtemperature conditions.
The forward voltage of a diode or diode-connected
transistor, operated at a constant current, exhibits a negative
temperature coefficient of about 2 mV/癈. Unfortunately,
the absolute value of V
BE
, varies from device to device, and
individual calibration is required to null this out, so the
technique is unsuitable for mass production.
The technique used in the ADM1030 is to measure the
change in V
BE
when the device is operated at two different
currents.
This is given by:
(eq. 1)
DV
BE
+ KTq ln(N)
where:
K is Boltzmanns constant
q is charge on the carrier
T is absolute temperature in Kelvins
N is ratio of the two currents
Figure 18 shows the input signal conditioning used to
measure the output of an external temperature sensor. This
figure shows the external sensor as a substrate transistor,
provided for temperature monitoring on some
microprocessors, but it could equally well be a discrete
transistor.
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