参数资料
| 型号： | ADP1046ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 28/92页 |
| 文件大小： | 0K |
| 描述： | IC DGTL CTRLR 32LFCSP |
| 标准包装： | 5,000 |
| 应用： | 电源 |
| 输入电压： | 0 V ~ 1.6 V |
| 电源电压： | 3 V ~ 3.6 V |
| 电流 - 电源： | 20mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-WQ（5x5） |
| 包装： | 带卷 (TR) |
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ADP1046
POWER READINGS
The output power value register (Register 0x19) is the product
of the VS3 voltage value and the CS2 current value. Therefore,
a combination of the formulas in the Voltage Readings section
and the CS2+, CS2? Pins section is used to calculate the power
reading in watts. This register is a 16-bit word. It multiplies two
12-bit numbers and discards the eight LSBs.
P OUT = V OUT × I OUT
For example,
P OUT = 12 V × 4.453 A = 53.436 W
Data Sheet
The output of the RTD ADC is linearly proportional to the vol-
tage on the RTD pin. However, thermistors exhibit a nonlinear
function of resistance vs. temperature. Therefore, the user must
perform postprocessing on the RTD ADC reading to accurately
read the temperature.
By connecting an external resistor (R EXT ) in parallel with the
NTC thermistor (TH), a constant current can be used to
DAC
POWER MONITORING ACCURACY
RTD
ADC
The ADP1046 power monitoring accuracy is specified relative
R EXT
TH
to the full-scale range of the signal that it is measuring.
FIRST FLAG FAULT ID AND VALUE REGISTERS
When the ADP1046 registers several fault conditions, it stores
the value of the first fault in a dedicated register. For example,
if the overtemperature (OTP) fault is registered followed by an
OVP fault, the OTP flag is stored in the first flag ID register
(Register 0x10). This register gives the user more information
for fault diagnosis than a simple flag. The contents of this register
are latched, meaning that they are stored until read by the user.
The contents are also reset by toggling PSON. If a flag is set to
be ignored, it does not appear in the first flag register.
EXTERNAL FLAG INPUT (FLAGIN PIN)
The FLAGIN pin can be used to send an external fault signal
into the ADP1046 . Register 0x0A[3:0] can be used to program
the FLAGIN flag to trigger an action.
TEMPERATURE READINGS (RTD PIN)
The RTD pin is set up for use with an external negative tempera-
ture coefficient (NTC) thermistor. The RTD pin has an internal
programmable current source. An ADC monitors the voltage
on the RTD pin.
The RTD temperature value register, Register 0x1A, is updated
every 10 ms. The ADP1046 stores every ADC sample for 10 ms
and then outputs the average value at the end of the 10 ms period.
The RTD ADC has an input range of 1.6 V and a resolution of
12 bits, which means that the LSB size is 1.6 V/4096 = 390.625 μV.
The user is limited to an input range of 1.3 V, which means that the
maximum ADC output code is limited to 1.3 V/390.6 μV = 3328.
10μA/20μA/30μA/40μA
Figure 36. Temperature Measurement Using Thermistor
An internal, precision current source of 10 μA, 20 μA, 30 μA,
or 40 μA can be selected in Register 0x11. This current source
can be trimmed by means of an internal DAC to compensate
for thermistor accuracy (see the RTD/OTP Trim section). The
user can select the output current source using Bits[7:6] of
Register 0x11.
The ADP1046 implements a linearization scheme based on a
preselected combination of external components and current
selection for best performance when measuring linearized
temperatures in degrees Celsius in the industrial range.
For more information about the required thermistor and
selecting and trimming the precision current sources, see
the Temperature Linearization Scheme section.
Optionally, the user can process the RTD reading and perform
postprocessing in the form of a lookup table or polynomial
equation to match the specific NTC thermistor used. With the
internal current source set to 46 μA, the equation to calculate
the ADC code at a specified NTC thermistor value (Rx) is given
by the following formula:
ADC CODE = 46 μA × Rx /1.6 × 4096
For example, at 60°C, the NTC thermistor at the RTD pin is
21.82 k?.
RTD_ADC_CODE = 46 μA × 21.82 k?/1.6 × 4096 = 2570
RTD
RTD
ADC
SIGNAL
OTP
FLAG
100k?
NTC
16.5k?
RTD TEMPERATURE
VALUE REGISTER
CONDITIONING
RTD TEMPERATURE
VALUE IN °C
OTP
THRESHOLD
FLAGS
REG 0x1A[15:4]
REG 0x1B[7:0]
REG 0x2F[7:0]
Figure 37. RTD Pin Internal Details
Rev. B | Page 28 of 92
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