Circuit device and electronic device
A circuit device includes: a current source circuit; a first charging circuit; a second charging circuit; and a control circuit. The control circuit controls, when a current setting value is in a first current range, supply of a first charging current from the first charging circuit to a charging node. The control circuit controls, when the current setting value is in a second current range on a current side higher than the first current range, supply of a second charging current from the second charging circuit to the charging node. The control circuit sets both the first charging current and the second charging current to a non-supply state during a switching period between the first current mode and the second current mode.
1 . A circuit device comprising:
a current source circuit;
a first charging circuit configured to supply, based on an output current of the current source circuit, a first charging current as a charging current to a charging node;
a second charging circuit configured to supply, based on the output current of the current source circuit, a second charging current, which is greater than the first charging current, as the charging current to the charging node; and
a control circuit, wherein
the control circuit
controls, when a current setting value for setting a current value of the charging current is in a first current range, a first current mode in which the first charging current having a current value indicated by the current setting value is supplied from the first charging circuit to the charging node,
controls, when the current setting value is in a second current range on a current side higher than the first current range, a second current mode in which the second charging current having a current value indicated by the current setting value is supplied from the second charging circuit to the charging node, and
sets both the first charging current and the second charging current to a non-supply state during a switching period between the first current mode and the second current mode.
2 . The circuit device according to claim 1 , wherein
the control circuit
outputs a first enable signal for controlling the first charging current to a supply state or the non-supply state and a second enable signal for controlling the second charging current to the supply state or the non-supply state, and
during the switching period, sets both the first charging current and the second charging current to the non-supply state by deactivating the first enable signal and the second enable signal.
3 . The circuit device according to claim 2 , wherein
the first charging circuit is controlled to be enabled or disabled based on the first enable signal, and supplies the first charging current to the charging node when enabled,
the second charging circuit is controlled to be enabled or disabled based on the second enable signal, and supplies the second charging current to the charging node when enabled, and
during the switching period, the control circuit disables the first charging circuit and the second charging circuit by deactivating the first enable signal and the second enable signal.
4 . The circuit device according to claim 2 , further comprising:
a first transistor which is controlled to be turned on or off based on the first enable signal, and configured to supply the output current from the current source circuit to the first charging circuit when turned on; and
a second transistor which is controlled to be turned on or off based on the second enable signal, and configured to supply the output current from the current source circuit to the second charging circuit when turned on, wherein
during the switching period, the control circuit turns off the first transistor and the second transistor by deactivating the first enable signal and the second enable signal.
5 . The circuit device according to claim 1 , wherein
the control circuit outputs, based on the current setting value, a current source control value for controlling the output current of the current source circuit to the current source circuit,
in the first current mode, the current source circuit supplies, as the output current to the first charging circuit, a first current having a current value indicated by the current source control value, and the first charging circuit supplies the first charging current by amplifying the first current with a first gain, and
in the second current mode, the current source circuit supplies, as the output current to the second charging circuit, a second current having a current value indicated by the current source control value, and the second charging circuit supplies the second charging current by amplifying the second current with a second gain greater than the first gain.
6 . The circuit device according to claim 5 , wherein
the current source circuit includes
first to n-th current sources whose output or non-output of first to n-th constant currents, having current values weighted in binary, is controlled based on first to n-th control bit signals of the current source control value, n being an integer of 2 or more,
in the first current mode, a first transistor that supplies, as the first current to the first charging circuit, a current from a current source selected, based on the first to n-th control bit signals, from the first to n-th current sources, and
in the second current mode, a second transistor that supplies, as the second current to the second charging circuit, a current from a current source selected, based on the first to n-th control bit signals, from the first to n-th current sources.
7 . The circuit device according to claim 6 , wherein
the control circuit sets, based on the current setting value, a first setting value for setting the current value of the first charging current and a second setting value for setting the current value of the second charging current, and
the control circuit
outputs, in the second current mode, (i+1)-th to (i+n)-th bit signals among bit signals of the second setting value as the first to n-th control bit signals, i being an integer of 1 or more, and
outputs, in the first current mode, (i+1−k)-th to (i−k+n)-th bit signals among bit signals of the first setting value as the first to n-th control bit signals, k being an integer of 1 or more and i or less.
8 . The circuit device according to claim 5 , wherein
the current source circuit includes
a first current source circuit including m current sources whose output or non-output of m constant currents, having current values weighted in binary, is controlled based on an m-bit first current source control value, m being an integer of 2 or more, and
a second current source circuit including n current sources whose output or non-output of n constant currents, having current values weighted in binary, is controlled based on an n-bit second current source control value, n being an integer of m or more,
the control circuit outputs the m-bit first current source control value and the n-bit second current source control value as the current source control value,
the first current source circuit supplies, as the first current to the first charging circuit, a current from a current source selected, based on the m-bit first current source control value, from the m current sources, and
the second current source circuit supplies, as the second current to the second charging circuit, a current from a current source selected, based on the n-bit second current source control value, from the n current sources.
9 . The circuit device according to claim 8 , wherein
the control circuit
sets, based on the current setting value, a first setting value for setting the current value of the first charging current and a second setting value for setting the current value of the second charging current, and
outputs (i+1)-th to (i+n)-th bit signals among bit signals of the second setting value as the n-bit second current source control value, i being an integer of 1 or more, and
outputs (i+1−k)-th to (i−k+m)-th bit signals among bit signals of the first setting value as the m-bit first current source control value, k being an integer of 1 or more and i or less, and m being an integer of 2 or more and n or less.
10 . An electronic device comprising:
the circuit device according to claim 1 ; and
a battery coupled to the charging node.