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  • Case ID: 343588
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RV8263-C8 I2C issues

Luis Santos

Hello everyone,

I have a custom board with an nRF5340, which currently uses the internal clock. Im using toolchain v2.9.0 and SDK 2.9.0.

I'm trying to use the RV8263-C8 RTC to achieve accurate real-time tracking.

Here is my schematic:



My .dts:

&pinctrl {
	i2c1_default: i2c1_default {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
                    <NRF_PSEL(TWIM_SCL, 1, 3)>;
		};
	};

	i2c1_sleep: i2c1_sleep {
		group1 {
			psels = <NRF_PSEL(TWIM_SDA, 1, 2)>,
                    <NRF_PSEL(TWIM_SCL, 1, 3)>;
			low-power-enable;
		};
	};
};

&i2c1 {
	compatible = "nordic,nrf-twim";
	status = "okay";
	clock-frequency = <400000>;
	zephyr,concat-buf-size = <512>;

	pinctrl-0 = <&i2c1_default>;
	pinctrl-1 = <&i2c1_sleep>;
	pinctrl-names = "default", "sleep";

	rv_8263_c8: rv-8263-c8@51 {
		compatible = "microcrystal,rv-8263-c8";
		reg = <0x51>;
		status = "okay";
		clkout = <1024>;
		int-gpios = <&gpio1 0 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
	};
};

When I running the sample code:

#include <zephyr/kernel.h>
#include <zephyr/drivers/rtc.h>
#include <zephyr/logging/log.h>

LOG_MODULE_REGISTER(rtc_test, LOG_LEVEL_INF);

const struct device *rtc_dev = DEVICE_DT_GET(DT_NODELABEL(rv_8263_c8));

int main(void) {
    if (!device_is_ready(rtc_dev)) {
        LOG_ERR("RTC device not ready");
        return -1;
    }

    struct rtc_time set_time = {
        .tm_sec = 0,
        .tm_min = 0,
        .tm_hour = 0,
        .tm_mday = 1,
        .tm_mon = 1,
        .tm_year = 125,
        .tm_wday = 1,
    };

    if (rtc_set_time(rtc_dev, &set_time) != 0) {
        LOG_ERR("Failed to set RTC time");
        return -1;
    }

    while (1) {
        struct rtc_time curr_time;
        if (rtc_get_time(rtc_dev, &curr_time) == 0) {
            LOG_INF("Time: %02d:%02d:%02d", curr_time.tm_hour, curr_time.tm_min, curr_time.tm_sec);
        } else {
            LOG_ERR("Failed to read RTC");
        }
        k_sleep(K_SECONDS(1));
    }
    return 0;
}

My output:

SEGGER J-Link V8.12 - Real time terminal output
SEGGER J-Link (unknown) V1.0, SN=1050200307
Process: JLinkExe
[00:00:00.002,593] <dbg> microcrystal_rv8263c8: rv8263c8_in[00:00:00.001,159] <dbg> microcrystal_rv8263c8: rv8263c8_init: Configure ClkOut: 5
[00:00:00.006,561] <dbg> microcrystal_rv8263c8: rv8263c8_init: Configure ClkOut: 5
*** Booting nRF Connect SDK v2.9.0-7787b2649840 ***
*** Using Zephyr OS v3.7.99-1f8f3dc29142 ***
[00:00:02.161,743] <dbg> microcrystal_rv8263c8: rv8263c8_time_set: Set time: year = 125, mon = 1, mday = 1, wday = 1, hour = 0, min = 0, sec = 0
[00:00:02.672,515] <err> rtc_test: Failed to read RTC
[00:00:04.177,856] <err> rtc_test: Failed to read RTC
[00:00:05.683,166] <err> rtc_test: Failed to read RTC
[00:00:07.188,476] <err> rtc_test: Failed to read RTC
[00:00:08.693,786] <err> rtc_test: Failed to read RTC
[00:00:10.199,127] <err> rtc_test: Failed to read RTC

Using an oscilloscope, I observed that SDA and SCL show the same waveform.

I think there are no problems with the hardware connections. The pins are not short-circuited.

I’ve tried running other samples, but I keep getting the same issue.

When I add bias-pull-up to the pinctrl, I get a "device not ready" error.

Has anyone encountered this before or knows what might be going wrong?

Any help would be greatly appreciated!

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