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Data Sheet | Intel Enpirion Power Solutions: EM2130

Page 20

Figure 6: Power Sequencing

POWER OK

The EM2130 has a power good indicator at its output pin, POK. When de-asserted, POK indicates that the

output voltage is below the threshold value, 90% of the programmed output voltage in the default

configuration. When asserted, POK indicates that the output is in regulation, and no major faults are

present. As a result, POK de-asserts during any serious fault condition where power conversion stops and

re-asserts when the output voltage recovers.

The POK indication can be either push-pull or open-drain, selected based upon the PMBus™ address. For

addresses in the range 0x01 to 0x40, the POK signal is a push-pull output and no pull-up resistor is

required. For addresses in the range 0x41 to 0x7F, the POK signal is open-drain and may be wire-OR’d with

other open drain signals with an appropriate pull-up resistor. The Pull-Up resistor may be connected to

the VDD33 pin but it is not recommended to use the 5VCC supply. Table 15 describes the resistor values

which are used to set the PMBus address.

In a noisy application, it is strongly recommended that a 100nf decoupling capacitor be placed between

the POK pin and GND to act as a filter to unwanted external noise. When configured as a Push-Pull

output, a 10kΩ pull-down resistor to Gnd may be used instead to prevent any spurious noise spikes

appearing on POK upon power being applied to the module.

12873

April 10, 2020

Rev I

EVI-EM2COMIF Scheda tecnica(PDF) 20 Page - Intel Corporation