L9662 datasheet(64/80 Pages) STMICROELECTRONICS

64 / 80 page

Functional description

L9662

64/80

DocID028325 Rev 1

IFx/Vx output configuration

The IFx/Vx pins are high impedance by writing to D7 and D6 of the MCR and setting the bits

to 0. When the pins are enabled and if the pin is shorted to ground then the device can

source up to 100mA from VDD.

Analog output

Channels 2 and 3 of the device can by used to provide an analog feed back current as a

1/100th ratio of the sense current in this mode internal data register and decoder are

bypassed. This will allow the IF2/V2 and IF3/V3 pins to be connected to a resistor to ground

and provide an analog voltage equivalent to the sense current to be read by an A/D port.

These two pins have an internal clamp as protection. This feature is available for Channels

2 and 3.

Digital output

Channels 2 and 3 can be configured as a logic level output with the level reflecting if the

current is above or below the selected internal current threshold. See Table 33 for MCR and

CCR bit settings for this mode. The output voltage has a reversed polarity to the satellite

current such that when the current drawn by the satellite is below the current detection

threshold, the IFx/Vx signal level transitions into a high state, on the other hand if the current

drawn by the satellite exceeds the current detection threshold, IFx/Vx signal transitions into

a low state.

Channel 2 and 3 mode selection

These channels can be configured to decode satellite messages or Hall Effect sensors and

provide results through the SPI and/or the IFx/Vx pins. The following Table 33 shows the

settings for the MCR and CCR based on the interfacing to a sensor or satellite.

Table 33. MCR and CCR settings based on the interfacing to a sensor or satellite

Functions active

Information available

MCR

D7/D6

Bits

MCR

D5/D4

Bits

CCR

D5:D4

Bits

Channel

(ICHx)

Decoder

SPI

DATA register

IFx/Vx pin

OFF (ICHx HiZ)

OFF

Empty

OFF (HiZ)

OFF (ICHx HiZ)

OFF

Empty

OFF (HiZ)

OFF (ICHx HiZ)

OFF

Empty

ON (1)

OFF (ICHx HiZ)

OFF

Empty

VDD

OFF

Empty

OFF (HiZ)

OFF

Data will reflect if ICHx current

is above/below threshold setting

(1)

D0 = 0 (above thres.)

D0 = 1 (below thres.)

OFF (HiZ)

OFF

Empty

Analog Output

(I_Sat/100)

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