参数资料
型号: ADM1069AST
厂商: ANALOG DEVICES INC
元件分类: 电源管理
英文描述: 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP32
封装: MS-026-BBA, LQFP-32
文件页数: 9/36页
文件大小: 763K
代理商: ADM1069AST
ADM1069
Rev. A | Page 17 of 36
DEFAULT OUTPUT CONFIGURATION
All of the internal registers in an unprogrammed ADM1069
device from the factory are set to zero. Because of this, the
PDOs are pulled to GND by a weak (20 kΩ) on-chip pull-down
resistor.
All PDOs behave as follows as the input supply to the
ADM1069 ramps up on VPn or VH:
Input supply 0 V to 1 V. PDOs high impedance.
Input supply 1 V to 2.7 V. PDOs pulled to GND by a weak
(20 kΩ) on-chip pull-down resistor.
Supply > 2.7 V. Factory programmed devices continue to
pull all PDOs to GND by a weak (20 kΩ) on-chip pull-down
resistor. Programmed devices download current EEPROM
configuration data and the programmed setup is latched. PDO
then goes to the state demanded by the configuration. This
provides a known condition for the PDOs during power-up.
The internal pull-down can be overdriven with an external pull-
up of suitable value tied from the PDO pin to the required pull-up
voltage. The 20 kΩ resistor must be accounted for in calculating
a suitable value. For example, if PDOn must be pulled up to 3.3 V,
and 5 V is available as an external supply, the pull-up resistor
value is given by
3.3 V = 5 V × 20 kΩ/(RUP + 20 kΩ)
Therefore,
RUP = (100 kΩ 66 kΩ)/3.3 V = 10 kΩ
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