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參數(shù)資料
| 型號： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 20/88頁 |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 27 of 88 | www.onsemi.com
The VBATT current drain when a measurement is being made is
calculated by
PERIOD
PULSE
BATT
t
V
I
×
=
kΩ
100
where:
tPULSE is the VBATT measurement time (~711 μs typical).
tPERIOD is the time required to measure all analog inputs.
Monitoring cycle time depends on the ADT7462 configuration.
Calculating the monitoring cycle time is described in more
detail in the ADC Information section.
VBATT Input Battery Protection
In addition to minimizing battery current drain, the VBATT
measurement circuitry is specifically designed with battery
protection in mind. Internal circuitry prevents the battery from
being back-biased by the ADT7462 supply or through any other
path under normal operating conditions. In the unlikely event
of a catastrophic ADT7462 failure, the ADT7462 includes a
second level of battery protection, including a series 3 kΩ
resistor to limit current to the battery, as recommended by UL
(see Figure 38). Thus, it is not necessary to add a series resistor
between the battery and the VBATT input; the battery can be
connected directly to the VBATT input to improve voltage
measurement accuracy.
055
69-
028
ADC
VBATT
DIGITAL
CONTROL
49.5k
82.7k
4.5pF
3k
Figure 38. Equivalent VBATT Input Protection Circuit
ADC INFORMATION
Round Robin
Both temperature and voltage measurements are analog inputs
that are digitized using the on-board ADC. An internal
multiplexer switches between the different analog inputs and
digitizes them, in turn, in a round-robin manner. The total
conversion time depends upon how the ADT7462 is configured.
The conversion times for each measurement channel are shown
in Table 18. The complete conversion time is the sum of the time
for the voltage and temperature measurements.
For example, if the ADT7462 is configured as Easy Configuration
Option 1, the round-robin conversion time is calculated as follows:
Total Conversion Time =
1 × (Local Conversion Time) + 3 × (Remote Conversion
Time) + 4 × (Voltage Measurement Time)
The TACH is not measured using the ADC and so is not part of
the round-robin monitoring cycle.
Table 18. Measurement Channel Conversion Times
Channel
Conversion Time (ms)
Local Temperature
9.01
Remote Temperature
38.36
Voltage
8.53
For each ADC temperature and voltage measurement read from
their value registers, 16 readings have actually been made
internally and the results averaged before being placed in the
value register.
Bypass Voltage Attenuators
There are up to 13 voltage measurement channels on the
ADT7462. Each of these voltage measurement channels has an
input structure (see Figure 37 for input structures for each of
the voltage channels). Because the ADC has a voltage input
range from 0 V to 2.25 V, these input circuits attenuate the
voltage input using a resistor divider network to match the
input range of the ADC. However, the user may occasionally
want to remove the attenuators and directly apply a voltage of
between 0 V and 2.25 V to the ADC. These attenuators can be
disabled by setting relevant bits in the voltage attenuator
configuration registers (see Table 19). This feature also allows
the user to rescale the voltage inputs using an external attenu-
ator circuit. However, when the attenuators are disabled, the
user should ensure that the voltage on the pin never exceeds 2.25 V.
Table 19. Voltage Attenuator Configuration Registers
Register Name
Register Address
Voltage Attenuator Configuration Register 1
0x18
Voltage Attenuator Configuration Register 2
0x19
Single-Channel ADC Conversions
Setting Bit 2 of the EDO Enable register (0x16) places the
ADT7462 into single-channel mode. In this mode, the
ADT7462 can be made to convert on a single voltage or
temperature channel only. The channel to be converted on is
selected by writing to Bits [7:3] of the EDO (single-channel)
Enable register (0x16). When the device is in single-channel
mode, the pin configuration option should not be changed.
Note that when the Pin 26 voltage, which includes the VBATT
option, is selected in single-channel mode, this means that
voltage measurements are continuously made in this mode. If
a battery is connected to this input, this results in an excessive
current drain on the battery. The specification of >10 years of
battery life is valid only when the battery voltage is measured as
part of the round robin and not in single-channel mode.
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