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| 型号： | ADM1169ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC SEQUENCER/SUPERVISOR 40LFCSP |
| 标准包装： | 1 |
| 系列： | Super Sequencer® |
| 应用： | 电源监控器，序列发生器 |
| 输入电压： | 3 V ~ 14.4 V |
| 电源电压： | 3 V ~ 14.4 V |
| 电流 - 电源： | 4.2mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 40-LFCSP-WQ（6x6） |
| 包装： | 托盘 |
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ADM1169
INPUTS
SUPPLY SUPERVISION
The ADM1169 has eight programmable inputs. Four of these are
Data Sheet
the bottom of each range (V B ), and the range itself (V R ).
dedicated supply fault detectors (SFDs). These dedicated inputs
are called VH and VPx (VP1 to VP3) by default. The other four
inputs are labeled VXx (VX1 to VX4) and have dual functionality.
They can be used either as SFDs, with functionality similar to the
VH and VPx, or as CMOS-/TTL-compatible logic inputs to the
device. Therefore, the ADM1169 can have up to eight analog
inputs, a minimum of four analog inputs and four digital inputs,
or a combination thereof. If an input is used as an analog input,
Table 5. Voltage Range Limits
Voltage Range (V) V B (V)
0.573 to 1.375 0.573
1.25 to 3.00 1.25
2.5 to 6.0 2.5
6.0 to 14.4 6.0
The threshold value required is given by
V R (V)
0.802
1.75
3.5
8.4
it cannot be used as a digital input. Therefore, a configuration
requiring eight analog inputs has no available digital inputs.
PROGRAMMING THE SUPPLY FAULT DETECTORS
The ADM1169 can have up to eight SFDs on its eight input
channels. These highly programmable reset generators enable
the supervision of up to eight supply voltages. The supplies can
be as low as 0.573 V and as high as 14.4 V. The inputs can be
configured to detect an undervoltage fault (the input voltage
drops below a preprogrammed value), an overvoltage fault (the
input voltage rises above a preprogrammed value), or an out-of-
window fault (the input voltage is outside a preprogrammed
range). The thresholds can be programmed to an 8-bit resolution
in registers provided in the ADM1169 . This translates to a voltage
resolution that is dependent on the range selected. The resolution
is given by
V T = ( V R × N )/255 + V B
where:
V T is the desired threshold voltage (undervoltage or overvoltage).
V R is the voltage range.
N is the decimal value of the 8-bit code.
V B is the bottom of the range.
Reversing the equation, the code for a desired threshold is given by
N = 255 × ( V T ? V B )/ V R
For example, if the user wants to set a 5 V overvoltage threshold
on VP1, the code to be programmed in the PS1OVTH register
(as described in the AN-721 Application Note ) is given by
N = 255 × (5 ? 2.5)/3.5
Therefore, N = 182 (1011 0110 or 0xB6).
Step Size = Threshold Range /255
Therefore, if the high range is selected on VH, the step size can
be calculated as follows:
(14.4 V ? 6.0 V)/255 = 32.9 mV
Rev. A | Page 14 of 36
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