Sensor arrangement for light sensing and temperature sensing and method for light sensing and temperature sensing

摘要

A sensor arrangement for light sensing and temperature sensing comprises a first sensor input (1) for connecting a temperature sensor (11) and a second sensor input (2) for connecting a light sensor (21), in particular an ambient light sensor. A sensor switch (S3) electrically connects either the first or the second sensor input (1, 2) to an integration input (41) of an integrating analog-to-digital converter (4). A reference circuit (5) connects to the integration input (41) via a first switch (S2). A first reference input (42) of the integrating analog-to-digital converter (4) is to be connected with a first reference potential (Vb1). A counter (6) connects to an integration output (43) of the integrating analog-to-digital converter (4). And a controller unit (6) connects to the counter (6) and is designed to control the first switch (S2) depending on an integrated sensor signal (Vout) integrated by the integrating analog-to-digital converter (4).

主权项

1. A sensor arrangement for light sensing and temperature sensing, comprising:
a first sensor input (1) for connecting a temperature sensor (11) and a second sensor input (2) for connecting an ambient light sensor, a sensor switch (S3) for electrically connecting either the first or the second sensor input (1, 2) to an integration input (41) of an integrating analog-to-digital converter (4), a reference circuit (5) connected to the integration input (41) via a first switch (S2), a first reference input (44) of the integrating analog-to-digital converter (4) to be connected with a first reference potential (Vb3), and a microcontroller unit (6) connected to an integration output (43) of the integrating analog-to-digital converter (4) and designed to control the first switch (S2) depending on an integrated sensor signal (Vout) integrated by the integrating analog-to-digital converter (4) and depending on the first reference potential (Vb3),wherein the reference circuit (5) comprises a reference capacitor connected to
a reference terminal (53) to be connected with the second reference potential (Vb1), via a second switch (S1), a ground potential (54), via a third switch (S1′), the reference terminal (52) via a fourth switch (S2′), wherein the first, second, third and fourth switches (S1, S1′, S2′) are switched by means of the microcontroller unit (6) such that the first and fourth switch (S2, S2′) are in their open state when the second and third switches (S1, S1′) are in their closed state, and the first and fourth switch (S2, S2′) are in their closed state when the second and third switches (S1, S1′) are in their open state, andwherein the integrating analog-to-digital converter (4) comprises:
an integrator comprising an amplifier (401) with the integration input (41) and the second reference input (42) as input terminals, an amplifier output (45), and an integration capacitor (46) connecting the integration input (41) and the amplifier output (45), and a comparator (402) connected via a first comparator input (47) to the amplifier output (45), and comprising the first reference input (44) as second comparator input and comprising the integration output (43) as comparator output.