Texas Instruments Corporation

Keith Brouse

Hugo Cheung

Ralph Oberhuber

Michael Douglas Snedeker

Paul Eric Landman

Rahul Prakash

Joselito L Parguian

A device includes an interface. The interface includes a plurality of pins. The interface further includes first components configured to interpret signals received at the plurality of pins according to a first protocol. The device further includes second components configured to the interpret signals received at the plurality of pins according to a second protocol. The first components are configured to disable the second components in response to a determination that the signals received at the pins correspond to the first protocol. Further, the second components are configured to disable the first components in response to a determination that the signals received at the pins correspond to the second protocol.

Protocol auto-detection

A non-linear correction current ICTAT(current complementary to the square of absolute temperature) is generated from a current IPTAT (current proportional to absolute temperature) and a current ICTAT (current complementary to absolute temperature), both modified in a circuit having a topology and components which capitalize on the logarithmic relationship between transistor collector current and base-emitter voltage. The resulting ICTATcurrent (current complementary to the square of absolute temperature) is injected into a node of a bandgap reference circuit to compensate for non-linear temperature effects on output voltage. A more general correction circuit generates both IPTATand ICTAT, and applies each to a respective multiplier which, in a preferred embodiment, is a current DAC configured as a multiplier. Control inputs CTLand CTLto respective multipliers set the amplitudes of the modified IPTATand ICTAToutput currents, which are then summed to generate the compensating current Icomp which is injected to the appropriate node in the bandgap reference circuit as described above. By adjusting the relative amplitudes of the IPTATand ICTATcurrents, a wide range of compensating current versus voltage curves is produced, allowing the optimization of a wide range of bandgap reference circuits. An optimal value for CTLis determined by holding CTLconstant, then measuring curvature at a plurality of CTLvalues. That CTLvalue closest to the interpolated value at which curvature is minimized is then used.

Method and circuit for curvature correction in bandgap references with asymmetric curvature

A method reading bank register values is provided. Register values are stored in a readback bank. The register values are output sequentially from the serial bank. An indicator is received by the serial bank. A determination is then made as to whether the indicator was received by the serial bank prior to completion of the outputting of the register values. If the indicator was received prior to completion of the outputting of the register values, the register values are loaded into the serial bank from the readback bank.

Readback registers

Systems and methods are provided for providing a filtered, thermometer coded output signal from an N bit digital input, where N is an integer greater than one. A truncated lookup table provides a corresponding truncated thermometer code in response an address related to the N bit digital input. A code recovery assembly transforms the truncated thermometer code into a thermometer coded output according to a recovery bit associated with the N bit digital input.

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Murphy, TX, United States of America

Keith Brouse