NPM1100-CAAA-R datasheet(16/58 Pages) NORDIC

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Core components

Limit set method

Pin configuration

VBUS current limit

Fixed 100 mA

ISET = D- = AVSS

D+ = NC

100 mA

Fixed 500 mA

ISET = VSYS

D- = AVSS

D+ = NC

500 mA

USB port detection

ISET = AVSS

D+ and D- are connected to host

100 mA if SDP detected

500 mA if DCP/CDP detected

USB port detection and

negotiation (requires a USB

enabled microcontroller)

ISET = microcontroller GPIO

D+ and D- connected to USB

host

100 mA if SDP detected,

ISET =

LOW

500 mA if SDP detected,

ISET =

HIGH

500 mA if DCP/CDP

Table 8: Pin configuration for

VBUS current limit

When a microcontroller is controlling

ISET with GPIO for USB port negotiation, ISET must be set

LOW on reset and whenever USB is disconnected.

ISET is only set HIGH when the USB port is SDP and

negotiation for a higher current limit is complete.

See the circuit schematics in the Reference circuitry on page 44 for designs illustrating these

configurations.

6.1.2 SYSREG resistance and output voltage

SYSREG regulates the VINT voltage to VSYSREG. When the

VBUS pin voltage is below VSYSREG, there is

typically RONREG resistance between

VBUS and VINT.

6.1.3 VBUS overvoltage and undervoltage protection

The overvoltage threshold for

VBUS is VBUSOVP. The undervoltage threshold for VBUS is VBUSMIN.

SYSREG is disabled when

VBUS voltage is above the overvoltage threshold VBUSOVP, or below the

undervoltage threshold VBUSMIN. This isolates

VBUS and prevents current flowing from VINT to VBUS.

6.1.4 VBUS disconnect

SYSREG isolates

VBUS from VINT when VBUS is disconnected and the voltage drops below VBUSMIN.

When

VBUS reaches VBUSULP, the device enters an ultra-low power (ULP) operation mode. This takes

TDISCONN, dependent on capacitive load on

VBUS. The device stays in a ULP mode while VBUS is under

VBUSULP.

6.1.5 Electrical parameters

Symbol

Description

Min.

Typ.

Max.

Units

IBUSLIM1

Max

VBUS input current, CDP/DCP USB or ISET =

HIGH

450

500

4445_367 v1.0

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