L6460 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6460' PDF : 139 Pages View PDF
L6460
16 Current DAC circuit
Current DAC circuit
L6460 includes a multiple range 6-bit current sink DAC. The LSB value of this DAC can be
selected using the DacRange[1:0] bits in the CurrDacCtrl register.
The output of this circuit is connected to GPIO[8] that is a 5 V tolerant pin. The value of this
pin can be converted using ADC. The pin value can be scaled before being converted by
enabling the internal resistor divider connected to this pin. If the current sunk by resistor
divider is not acceptable the pin voltage can be converted without scaling its value. When
the conversion without scaling resistor is chosen a clamping connection is used to avoid
voltage compatibility of the pin to the ADC system. The clamping circuit will sink a typical
current of half microampere from the pin during the sampling time.
Figure 25. Current DAC block diagram
DacRange [1:0]
Va3
Reference Current
Generator
EnDac
DacValue[5:0]
DacRange[1:0]
Gpio8 Clamp
(to ADC)
Current Sink
DAC
RCurrDac
Clamp circuit
EnDac
A2DChannel1: [40] Combinatorial
Mask
A2DChannel2: [40] Combinatorial
Mask
Address
Recognized
Address
Recognized
EnDacScale
Gpio[8] Digital Driver
Gpio[8]
The circuit is enabled by setting to logic ‘1’ the EnDac bit in the CurrDacCtrl register then the
desired sunk current value is chosen by changing the value of the DacValue[5:0] bits in the
same register being DacValue[0] the least significant bit and DacValue[5] the most
significant bit.
Doc ID 17713 Rev 1
85/139
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