UPS 3 Click Board™

How Does The UPS 3 Click Board™ Work?

The UPS 3 Click Board™ as its foundation uses the LTC3110, a bidirectional buck-boost DC/DC regulator with a capacitor charger and balancer from Analog Devices. The buck-boost regulator utilizes a proprietary switching algorithm that allows the system voltage to be regulated above, below, or equal to the voltage on the storage element without discontinuity in inductor current or large voltage ripple in the backup voltage. During charging, a limit for the average current drawn from the system power source is accurately programmed with an external resistor and set to 450mA. It also has an integrated, active voltage balancing buffer that prevents capacitor overvoltage conditions caused by capacitor mismatch while charging a stack of supercapacitors.

The LTC3110 operates in two modes, Backup and Charge mode. In Backup mode, the device maintains a system voltage of 1.8V to 5.25V, powered from the supercapacitor stored energy. This feature ensures that all usable stored supercapacitor energy is utilized, thereby extending backup times or shrinking the storage capacitors. In Charge mode, when the primary power system labelled as VSYS is active, the LTC3110 can independently or through user command reverse the direction of power flow using the regulated system voltage to charge and balance the supercapacitors. Also, this Click board™ uses Charge/Backup Mode Indicator, routed on the INT pin of the mikroBUS™ socket, that is pulled in a low logic state while the regulator is in Charge mode, or a high while the regulator is in Backup mode.

The UPS 3 Click Board™ communicates with MCU using several GPIO pins. The EN pin, routed on the PWM pin of the mikroBUS™ socket, is used to put the LTC3110 into Normal operation mode or in a Shutdown. The LTC3110 includes a voltage comparator used to supervise voltage on the storage element associated with the ERR pin of the mikroBUS™ socket alongside a pin labeled as COK, routed on the RST pin of the mikroBUS™ socket, to indicate the energy storage element's charging state.

In addition to all these features, the UPS 3 Click Board™ also has several selectable jumpers. One of them labelled as MODE offers to select between variable or fixed-frequency switching algorithm, Burst or PWM Mode, setting onboard SMD jumper to an appropriate position marked as FIXED and BURST. The other one labelled as FB SEL represents Backup Voltage Feedback Selection which offers the choice between 3.2V and 4.8V to set the voltage on the load when the supercapacitor discharges in Backup mode.

With the DIR pin routed on the CS pin of the mikroBUS™ socket, the LTC3110 can instantly reverse the inductor current and change between Charging and Backup operation modes, reacting quickly on a power failure condition by providing the backup voltage to the system. In combination with the jumper labelled as DIR, this pin allows automatic charging of the supercapacitor when a system voltage is present and works as a DC/DC converter providing system backup power to the load due to lack of system power. Otherwise, users have control over charging and discharging the supercapacitor manually, changing the DIR pin's logic state.

The UPS 3 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper or through SMD jumpers labeled as JP5 and JP6 through which the VSYS voltage powers up the mikroBUS™ 3.3V and 5V power rails. It allows for both 3.3V and 5V capable MCUs to use communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the UPS 3 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Storage Element Voltage Comparator	ERR	1	AN	PWM	16	EN	Shutdown Control
Storage Element Charge Indicator	COK	2	RST	INT	15	INT	Charge/Backup Mode Indicator
Charge/Backup Mode Selection	DIR	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
NC	5	MISO	SCL	12	NC
NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

UPS 3 CLICK ELECTRICAL SPECIFICATIONS