Abstract: A test system includes a test data generator to provide test data (e.g., a test pattern) to a subject circuit (e.g., a digital television video circuit). The test data is functionally to verify the subject circuit. The functional verification of the subject circuit is performed utilizing an output of the subject circuit generated responsive to the test data in accordance with an operational functionality of the subject circuit. The test data generator is also coupled to provide the test data to a built-in self-test (BIST) circuit so as to enable the built-in self-test circuit to receive the test data.

Abstract: A gas-fired water heater is provided with a combustion shutoff system which precludes further combustion within the water heater's combustion chamber in response to a combustion temperature therein reaching a predetermined level correlated to and indicative of a predetermined, undesirably high concentration of carbon monoxide present in the combustion chamber. In various illustrated embodiments thereof, the combustion shutoff system is operative to terminate further combustion air inflow to the combustion chamber, or terminate further fuel flow to the burner portion of the water heater.

Abstract: A gas-fired water heater is provided with a combustion shutoff system which precludes further combustion within the water heater's combustion chamber in response to a combustion temperature therein reaching a predetermined level correlated to and indicative of a predetermined, undesirably high concentration of carbon monoxide present in the combustion chamber. In various illustrated embodiments thereof, the combustion shutoff system is operative to terminate further combustion air inflow to the combustion chamber, or terminate further fuel flow to the burner portion of the water heater.

Abstract: A test system includes a test data generator to provide test data (e.g., a test pattern) to a subject circuit (e.g., a digital television video circuit). The test data is functionally to verify the subject circuit. The functional verification of the subject circuit is performed utilizing an output of the subject circuit generated responsive to the test data in accordance with an operational functionality of the subject circuit. The test data generator is also coupled to provide the test data to a built-in self-test (BIST) circuit so as to enable the built-in self-test circuit to receive the test data.

Abstract: A keypad encoder is used with a keypad having an array of keys arranged in columns and rows. Depressing any key on the keypad closes a corresponding switch, coupling one of the columns to one of the rows. The keypad encoder includes a resettable logic circuit that generates a control signal having first and second states that control the mode of operation of the keypad encoder. A scanning circuit asserts a scanning signal on the columns of the keypad in a predefined sequence when the control signal is in the first state and asserts the scanning signal on all of the columns of the keypad simultaneously when the control signal is in the second state. An encoder circuit identifies which row, if any, has a closed switch in any of the keypad columns on which the scanning circuit has asserted the scanning signal.