Hello All - long time no post!!
I've got myself confused as to voltage regulators - I need my hand held for a minute.
I'm just revisiting a handheld battery powered lighting control project I was working on last year and just about to finalise the circuit.
For various reasons I have to use an existing (small) handheld enclosure which is designed around an A23 12V battery. Originally I was going to base the unit on a Holtek 12E which was going to be fine for 12V. I have since found TXE-433-KH2 module and the 'Splatch' antenna by Link Technologies. The TXE-433-KH2 is spec'ed at 2.7 to 5.2 V. So it follows a 3.3V supply would by ideal.
Now, since it is battery fed I don't particularly want to go down the 317 (linear regulator), Zener diode route because of battery drain so I have been looking at the LP2953 LDO regulator from National. (as, in addition, it would be nice to incorporate a low battery/tranmit LED flash function to the unit)
Maximum current will be 15mA (10mA for the LED, 5mA for encoder/transmitter)
So to my questions
1) Are there any better regulators out there which has low quiescent current drain for long battery life.
2) Would o implementing a 'start up' pulse to the regulator/battery circuit when a key was pressed be a better option. If so how would the start up affect the encoding and transmitting of the code(s). Will there be a problem with the length of time the key is pressed and the time it takes for the correct voltage to be 'delivered' and the encoding and transmitting of data.
Thanks in advance
Matt
I've got myself confused as to voltage regulators - I need my hand held for a minute.
I'm just revisiting a handheld battery powered lighting control project I was working on last year and just about to finalise the circuit.
For various reasons I have to use an existing (small) handheld enclosure which is designed around an A23 12V battery. Originally I was going to base the unit on a Holtek 12E which was going to be fine for 12V. I have since found TXE-433-KH2 module and the 'Splatch' antenna by Link Technologies. The TXE-433-KH2 is spec'ed at 2.7 to 5.2 V. So it follows a 3.3V supply would by ideal.
Now, since it is battery fed I don't particularly want to go down the 317 (linear regulator), Zener diode route because of battery drain so I have been looking at the LP2953 LDO regulator from National. (as, in addition, it would be nice to incorporate a low battery/tranmit LED flash function to the unit)
Maximum current will be 15mA (10mA for the LED, 5mA for encoder/transmitter)
So to my questions
1) Are there any better regulators out there which has low quiescent current drain for long battery life.
2) Would o implementing a 'start up' pulse to the regulator/battery circuit when a key was pressed be a better option. If so how would the start up affect the encoding and transmitting of the code(s). Will there be a problem with the length of time the key is pressed and the time it takes for the correct voltage to be 'delivered' and the encoding and transmitting of data.
Thanks in advance
Matt