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| 型号： | ADM1064ASUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/32页 |
| 文件大小： | 0K |
| 描述： | IC SEQUENCER/SUPERVISOR 48-TQFP |
| 标准包装： | 1 |
| 系列： | Super Sequencer® |
| 类型： | 序列发生器 |
| 监视电压数目： | 10 |
| 输出： | 可编程 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TQFP |
| 供应商设备封装： | 48-TQFP（7x7） |
| 包装： | 托盘 |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
| 配用： | EVAL-ADM1064TQEB-ND - BOARD EVALUATION FOR ADM1064TQ |
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ADM1064
VOLTAGE READBACK
The ADM1064 has an on-board 12-bit accurate ADC for
voltage readback over the SMBus. The ADC has a 12-channel
analog mux on the front end. The 12 channels consist of the
Table 9. ADC Input Voltage Ranges
SFD Input
Range (V) Attenuation Factor
ADC Input Voltage
Range (V)
10 SFD inputs (VH, VPx, and VXx) and two auxiliary (single-
0.573 to 1.375
1
0 to 2.048
The upper limit is the absolute maximum allowed voltage on the VPx and
ended) ADC inputs (AUX1 and AUX2). Any or all of these
inputs can be selected to be read, in turn, by the ADC. The
circuit controlling this operation is called the round-robin
circuit. This circuit can be selected to run through its loop of
conversions once or continuously. Averaging is also provided
for each channel. In this case, the round-robin circuit runs through
its loop of conversions 16 times before returning a result for each
channel. At the end of this cycle, the results are written to the
output registers.
The ADC samples single-sided inputs with respect to the
AGND pin. A 0 V input gives out Code 0, and an input equal to
the voltage on REFIN gives out full code (4095 decimal).
The inputs to the ADC come directly from the VXx pins and
from the back of the input attenuators on the VPx and VH pins,
1.25 to 3.00 2.181 0 to 4.46
2.5 to 6.0 4.363 0 to 6.0 1
6.0 to 14.4 10.472 0 to 14.4 1
1
VH pins.
The typical way to supply the reference to the ADC on the
REFIN pin is to connect the REFOUT pin to the REFIN pin.
REFOUT provides a 2.048 V reference. As such, the supervising
range covers less than half the normal ADC range. It is possible,
however, to provide the ADC with a more accurate external
reference for improved readback accuracy.
Supplies can also be connected to the input pins purely for ADC
readback, even though these pins may go above the expected
supervisory range limits (but not above the absolute maximum
ratings on these pins). For example, a 1.5 V supply connected to
VXx
NO ATTENUATION
12-BIT
ADC
DIGITIZED
VOLTAGE
READING
the VX1 pin can be correctly read out as an ADC code of approxi-
mately 3/4 full scale, but it always sits above any supervisory limits
that can be set on that pin. The maximum setting for the REFIN
pin is 2.048 V.
2.048V VREF
Figure 27. ADC Reading on VXx Pins
SUPPLY SUPERVISION WITH THE ADC
In addition to the readback capability, another level of supervi-
sion is provided by the on-chip, 12-bit ADC. The ADM1064 has
VPx/VH
ATTENUATION NETWORK
(DEPENDS ON RANGE SELECTED)
12-BIT
ADC
DIGITIZED
VOLTAGE
READING
limit registers with which the user can program a maximum or
minimum allowable threshold. Exceeding the threshold generates
a warning that can either be read back from the status registers
or input into the SE to determine what sequencing action the
ADM1064 should take. Only one register is provided for each input
2.048V VREF
Figure 28. ADC Reading on VPx/VH Pins
The voltage at the input pin can be derived from the following
equation:
channel. Therefore, either an undervoltage threshold or overvoltage
threshold (but not both) can be set for a given channel. The round-
robin circuit can be enabled via an SMBus write, or it can be
programmed to turn on in any state in the SE program. For
example, it can be set to start after a power-up sequence is
complete, and all supplies are known to be within expected
V =
ADC Code
4095
× Attenuation Factor × V REFIN
tolerance limits.
Note that a latency is built into this supervision, dictated by the
where V REFIN = 2.048 V when the internal reference is used (that
is, the REFIN pin is connected to the REFOUT pin).
The ADC input voltage ranges for the SFD input ranges are
conversion time of the ADC. With all 12 channels selected, the
total time for the round-robin operation (averaging off) is
approximately 6 ms (500 μs per channel selected). Supervision
using the ADC, therefore, does not provide the same real-time
response as the SFDs.
Rev. D | Page 20 of 32
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