Low power ultra-wide-band transmitter
Systems, devices and methods are disclosed for an ultra-wide-band (UWB) transmitter tag capable of operating in different power mode depending on voltage level and/or host interruption signal. The transmitter tag comprises a power management circuit, a one-time-programmable memory (OTP), a read/write memory, a state machine for controlling/monitoring the operation of the tag. The tag goes into the high power mode when the power supply ramps up to a preset voltage level. During the high power mode, the tag consumes the higher level of electrical current as indicated by the battery current signal. Upon completion of high power consumption activity, such as OTP memory download, the tag exits the high power mode and enters the low power mode. The power supply current goes to the low level to minimize the power consumption by the tag.
1. An ultra-wide-band (UWB) transmitter tag comprising:
a power management circuit coupled to a power supply for power consumption management of the UWB transmitter tag, the tag goes into a high power mode after the power supply ramps up to a preset voltage level;
a memory coupled to the power management circuit via a switch, the memory is switched on in the high power mode to download information stored in the memory into a read and write memory; and
a state machine coupled to the power management circuit, the state machine changes a status of a memory download signal after completion of the information download from the memory to enable the UWB transmitter tag into a low power mode.
2. The UWB transmitter tag of claim 1 wherein the memory is a one-time-programmable memory (OTP).
3. The UWB transmitter tag of claim 1 wherein the memory download signal is set to low during the information download and set to high after completion of the information download.
4. The UWB transmitter tag of claim 1 wherein in the low power mode, the UWB transmitter tag is in a sleep mode during a preset time interval and enters a transit mode to transmit a UWB signal at the end of the preset time interval.
5. The UWB transmitter tag of claim 4 wherein the UWB transmitter tag goes back to the sleep mode from the transit mode after the UWB signal is transmitted.
6. The UWB transmitter tag of claim 1 further comprises a test and calibration access (TC access) coupled to the state machine, the TC access communicates to an outside host controller via a test port on the UWB transmitter tag.
7. The UWB transmitter tag of claim 6 wherein the UWB transmitter tag enters the high power mode when the state machine sets a host interrupt signal to high after the host controller sends an interrupt signal.
8. The UWB transmitter tag of claim 7 wherein the UWB transmitter tag enters the low power mode when the state machine sets the host interrupt signal to low after completion of one or more host controller initiated tasks.