RV-3028-C7 Development Board DATE: April 2018 Revision No.: 1 Page 1/3 Headquarters: Micro Crystal AG Muehlestrasse 14 CH-2540 Grenchen Switzerland Tel Fax Internet Email +41 32 655 82 82 +41 32 655 82 83 www.microcrystal.com sales@microcrystal.com Micro Crystal Development Board RV-3028-C7 RV-3028-C7 The RV-3028-C7 is soldered onto the Development Board. Every pin is accessible at test pins 1 - 8 and at the test vias situated around the device. The following passive components are already soldered on the board: C1 10 nF Decoupling capacitor between VSS and VDD C2 100uF Capacitor for Back-up power C3, C4 Option, to place alternative capacitors or battery for back-up power R1 330 Current limiting resistor for LED LED1 green Supply, current consumption of the LED has to be considered, J2 to switch off R2 10 k Pull-up resistor INT to VDD R3 10 k Pull-up resistor SCL to VDD R4 10 k Pull-up resistor SDA to VDD R5 10 k Pull-down resistor to define VBACKUP input in case it is not used DEVELOPMENT BOARD JUMPER 1 EVI = HIGH EVI = LOW JUMPER 2 LED JUMPER 3 VDD, CURRENT MEASURMENT JUMPER 4 SUPERCAP SET INPUT TO VSS 2/3 Micro Crystal Development Board RV-3028-C7 SCHEMATICS PINOUT RV-3028-C7 # 1 CLKOUT # 8 EVI # 2 INT # 7 VDD # 3 SCL # 6 VBACKUP # 4 SDA # 5 VSS PIN DESCRIPTION Symbol Pin # CLKOUT 1 INTk 2 SCL 3 SDA 4 VSS 5 VBACKUP 6 VDD 7 EVI 8 Description Clock Output; push-pull; Normal and Interrupt driven clock output can be activated concurrently. 1. Normal clock output is controlled by the CLKOE bit. When CLKOE is set to 1 (default), the CLKOUT pin drives the square wave on the CLKOUT pin. When CLKOE bit is set to 0, the CLKOUT pin is LOW. 2. Interrupt driven clock output is controlled by an interrupt event. When CLKIE is set to 1 the occurrence of the interrupt selected in the Clock Interrupt Mask Register (12h) allows the square wave output on the CLKOUT pin. Writing 0 to CLKIE will disable new interrupts from driving square wave on CLKOUT. When CLKF flag is cleared, the CLKOUT pin is LOW. Depending of the settings in the FD field, the CLKOUT pin can drive the square wave of 32.768 kHz (default), 8192 Hz, 1024 Hz, 64 Hz, 32 Hz or 1 Hz, or the predefined periodic countdown timer interrupt. When FD field is 111 the CLKOUT pin is LOW. Interrupt Output; open-drain; active LOW; requires pull-up resistor; used to output Alarm, Periodic Countdown Timer, Periodic Time Update and External Event Interrupt signals. Interrupt output also in VBACKUP Power state. I2C Serial Clock Input; requires pull-up resistor. In VBACKUP Power state, the SCL pin is disabled. I2C Serial Data Input-Output; open-drain; requires pull-up resistor. In VBACKUP Power state, the SDA pin is disabled (high impedance) Ground Backup Supply Voltage. When the backup switchover function is not needed, V BACKUP must be tied to VSS with a 10 k resistor Positive supply voltage; positive or negative steps in supply voltage may affect oscillator performance, recommend 10 nF decoupling capacitor close to the device External Event Input; used for interrupt generation, interrupt driven clock output and time stamp function. Remains active also in VBACKUP Power state. This pin should not be left floating Datasheet and Application-Manual are available for download under: www.microcrystal.com 3/3