FS6407 datasheet(23/111 Pages) NXP

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NXP Semiconductors

FS6407/FS6408

5.6

VCCA output, 5.0 V or 3.3 V selectable

The VCCA voltage regulator is used to provide an accurate voltage output (5.0 V, 3.3 V) selectable through an external resistor connected

to the SELECT pin.

The VCCA output voltage regulator can be configured using an internal transistor delivering very good accuracy (

±1.0% for 5.0 V

configuration and

±1.5% for 3.3 V configuration), with a limited current capability (100 mA) for an analog to digital converter, or with an

external PNP transistor, giving higher current capability (up to 300 mA) with lower output voltage accuracy (

±3.0% for 300 mA) when using

a local supply.

Current limitation, overvoltage, and undervoltage detectors are provided. VCCA can be turned ON or OFF via a SPI command, however

it is not recommended to turn OFF VCCA by SPI when VCCA is configured safety critical (both overvoltage and undervoltage have an

impact on RSTB and FS0B). VCCA overcurrent (with the use of external PNP only) and overvoltage information disables VCCA.

Diagnostics are reported in the dedicated register and generate an Interrupt. VCCA is enabled by default.

5.7

VAUX output, 5.0 V or 3.3 V selectable

The VAUX pin provides an auxiliary output voltage (5.0 V, 3.3 V) selectable through an external resistor connected to SELECT pin. It uses

an external PNP ballast transistor for flexibility and power dissipation constraints. The VAUX output voltage regulator can be used as

“auxiliary supply” (local supply) or “sensor supply” (external supply) with the possibility to be configured as a tracking regulator following

VCCA.

Current limitation, overvoltage, and undervoltage detectors are provided. VAUX can be turned ON or OFF via a SPI command, however

it is not recommended to turn OFF VAUX by the SPI when VAUX is configured safety critical (both overvoltage and undervoltage have an

impact on RSTB and FS0B). VAUX overcurrent and overvoltage information disables VAUX, reported in the dedicated register, and

generates an Interrupt. VAUX is enabled by default.

5.8

SELECT input (VCCA, VAUX voltage configuration)

VCCA and VAUX output voltage configurations are set by connecting an external resistor between the SELECT pin and Ground.

According to the value of this resistor, the voltage of VCCA and VAUX are configured after each Power On Reset, and after a wake-up

event when device is in LPOFF. Information latches until the next hardware configuration read. Regulator voltage values can be read on

the dedicated register via the SPI.

When VAUX is not used, the output VCCA voltage configuration is set using an external resistor connected between the SELECT and the

VPRE pin.

Table 6. VCCA/VAUX voltage selection (Figure 50)

VCCA(V)

VAUX(V)

R Select

Recommended value

3.3

<7.0 K

5.1 K

Ω ±5.0%

5.0

10.8 << 13.2 K

12 K

Ω ±5.0%

3.3

5.0

21.6 << 26.2 K

24 K

Ω ±5.0%

5.0

3.3

45.9 << 56.1 K

51 K

Ω ±5.0%

Table 7. VCCA voltage selection (VAUX not used, Figure 51, Figure 52)

VCCA(V)

R Select

Recommended Value

3.3

<7.0 K

5.1 K

Ω ±5.0%

21.6 << 26.2 K

24 K

Ω ±5.0%

5.0

10.8 << 13.2 K

12 K

Ω ±5.0%

45.9 << 56.1 K

51 K

Ω ±5.0%

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