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| 型号： | ADP1043A-USB-Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/72页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD DIG POWER SUPPLY |
| 标准包装： | 1 |
| 附件类型： | 连接 USB 至 I2C 的接收器 |
| 适用于相关产品： | ADP1043A |
| 相关产品： | ADP1043AACPZ-RLDKR-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLCT-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLTR-ND - IC SECONDARY SIDE CTRLR 32LFCSP |
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ADP1043A
CS2 Pin
The user sets the full-scale (FS) voltage drop—37.5 mV,
75 mV, or 150 mV—that is present across the R SENSE resistor
by programming Register 0x23, Bits[7:6].
The CS2 ADC has an input range of 250 mV. The resolution is
12 bits, which means that the LSB size is 250 mV/4096 = 61.04 μV.
The user is limited to an input range of 215 mV.
The equation to calculate the ADC code at a certain voltage
(V X ) is given by the following formula:
ADC Code = V X /250 mV × 4096
For example, when there is 150 mV on the input of the ADC
ADC Code = 150 mV/250 mV × 4096
ADC Code = 2457
Therefore, to convert the CS2 value reading to a real current,
use the following formula:
I OUT = ( CS2_Value /2457) × ( FS / R SENSE )
where:
FS is the full-scale voltage drop (37.5 mV, 75 mV, or 150 mV).
R SENSE is the sense resistor value.
For example, if CS2_Value = 1520, R SENSE = 20 mΩ, and
FS = 150 mV, the real current is calculated as follows:
I OUT = (1520/2457) × (150 mV/20 mΩ)
FIRST FLAG FAULT ID AND VALUE REGISTERS
When the ADP1043A 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 a PSON signal.
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 ADP1043A. The reaction to this flag can
be programmed in the same way as the internal flags.
TEMPERATURE READINGS (RTD PIN)
The RTD pin is set up for use with an external 100 kΩ negative
temperature coefficient (NTC) thermistor. The RTD pin has an
internal 10.8 μA current source. Therefore, with a 100 kΩ therm-
istor, the voltage on the RTD pin is 1 V at 25°C. An ADC on the
ADP1043A monitors the voltage on the RTD pin.
10μA
I OUT = 4.64 A
POWER READINGS
The output power value register (Register 0x19) is the product
of the VS3 voltage value and the CS2 current value. Therefore,
100k ?
NTC
RTD
RTD
ADC
RTD TEMPERATURE
VALUE REGISTER
REG 0x1A[15:4]
OTP
THRESHOLD
REG 0x2F[7:0]
OTP
FLAG
FLAGS
a combination of the formulas in the Voltage Readings section
and the CS2 Pin 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) × (4.64 A) = 55.68 W
POWER MONITORING ACCURACY
The ADP1043A power monitoring accuracy is specified relative
to the full-scale range of the signal that it is measuring.
Figure 28. RTD Pin Internal Details
The output of the RTD ADC is linearly proportional to the
voltage on the RTD pin. However, thermistors exhibit a non-
linear function of resistance vs. temperature. Therefore, it is
necessary to perform some postprocessing on the RTD ADC
reading to accurately read the temperature. This postprocessing
can be in the form of a lookup table or polynomial equation to
match the specific NTC being used.
OVERTEMPERATURE PROTECTION (OTP)
If the temperature sensed at the RTD pin exceeds the program-
mable threshold, the OTP flag is set. The hysteresis on this flag
is 16 mV (see Register 0x2F in Table 43 for details). The response
to the OTP flag is programmable.
The RTD trim is required to make accurate temperature readings
at the lower end of the RTD ADC range. This results in a more
accurate measurement for determining the OTP threshold (see
the RTD/OTP Trim section).
Rev. 0 | Page 23 of 72
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