Besides, total 12 pins of the MCU are fully reserved for the display unit. Here, the major difference I noticed is in the power supply connections of the MCU its pin 12 is connected to the +2.5V supply (VDD) rail. One week after this circuit surgery, I found another usb charger doctor circuit built around the Holtek OTP MCU HT46R064B (Enhanced A/D Type 8-Bit OTP MCU), circuit board and circuit diagram of which is shown below. This great design work amazes me because I already designed/published many digital voltmeter/ammeter circuits based on popular 5v/3.3v microcontrollers like AVR and PIC, but never tried an OTP MCU that works on < 2.5v, till date! Obviously, at the heart of this design is a low voltage (2.5V or less) MCU with built-in ADC and internal clock oscillator. Have a look at the MCU to DISPLAY wiring, clearly shown in the following table: Note that the output from the Vreg circuit is also attached to the decimal point (pin 3) of the LED display. Pin 5 is the ground and pin 13 is the VDD of the MCU. Pin 3 of the MCU is connected to the Vsense circuit, and Pin 4 is connected to the Isense circuit. OTP-based MCUs often provide the same peripherals and functionality as those found on flash-based devices, but at a reduced cost, or they can exceed the performance and functionality of flash-based MCUs at the same cost!Īll the pins except 3, 4, 5, 12 and 13 of the 16-pin MCU (U2) are routed to the LED display unit – Pin 1 drives B, Pin 2 drives d3, etc. Why an OTP MCU? As designers look for ways to reduce the cost of their embedded systems without compromising the availability of peripherals or system performance, a potential solution to explore is the option of using one-time programmable (OTP) microcontrollers (MCUs) in their designs. Wall Mount Smart Battery Chargers and Battery Maintainers are ideal for applications where space is. Here is the system diagram of the USB Charger Doctor for your quick reference: Universal Charger and Maintainer by Battery Doctor. The internal electronics is powered by an onboard voltage regulator, which regulates the usb bus power to a stable 2.5 volt dc supply. The USB Charger Doctor holds an OTP microcontroller, Voltage and Current Sensors, and one 7-segment LED display unit. Get the best deals for battery doctor charger at. As usual, I have an irresistible temptation to know how this device works, and just after 3 days from its arrival, I tried out the circuit surgery! The little usb bus powered device features a passthrough usb connection to connect the usb source port and usb device, and a 7-segment LED display driven by an on-board microcontroller to indicate the voltage and current. BATTERY DOCTOR Automatic Charger/Battery Maintainer: 6 & 12VDC 20028MSRP: 90Type Automatic Charger/MaintainerBattery Charger Type Automatic Charger/Battery. Reverse Polarity Protected - Battery Doc® chargers are reverse polarity protected! Assures no damage to your battery or charger if the leads are connected incorrectly.Recently I bought a little gizmo called as “USB Charger Doctor” from an online store.Charger dimensions: 4.5" long x 2.5" wide x 1.4" deep.Compact, Portable, and Ultra Light - This charger is about half the size and half the weight of other similar chargers! Packs easily on your bike.Safer to Use - Electronic switching technology chargers do not get warm to the touch, unlike transformer chargers, making them friendlier to use! Battery Doc® chargers are both short circuit protected and spark proof!.Electronic Switching Technology - Battery Doc® Chargers utilize electronic switching power technology as opposed to the linear technology (transformers) used with most other battery chargers.Maintains Batteries Up to 400 Amp Hours.Charges and Maintains Batteries from 5 to 200 Amp Hours.Includes Ring Terminal and Alligator Clip Cable Attachments.Easy-to-Read Battery Charge Status LEDs.Automatic "Switching Technology" Can Be Safely Connected to the Battery for Long Periods of Time.Reverse Hook-up Protection/Spark Resistant.
Smart Battery Technology Prevents Overcharging.Perfect for all BMW motorcycles from 1923 to now.
Highly efficient, the charger will safely charge and maintain your battery at peak condition 24 hours a day, 365 days a year. A 2 Amp charger for lead acid or gel cell batteries, 12 or 6-volt, the Rainproof Battery Doc is a state of the art electronic switching charger.
BATTERY DOCTOR CHARGER PORTABLE
Battery Doctor® makes the ideal portable Rainproof Smart Battery Charger.
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