Hi,
I am trying to interface a SHT40 temperature and humidity sensor with feather nrf9151 the sensor sensor is not detecting on i2c pins on header
on the same pin i have checked with logic analyser and getting i2c traffic as you can see the attached images there is ACK for LIS2DH and npm1300 on address 0×19 and 0×6b but not gatting any ACK on address 0×44(SHT40).

my code is

#if DT_HAS_ALIAS(sht40)
static const struct device *sht40_dev = DEVICE_DT_GET(DT_ALIAS(sht40));
#else
static const struct device *sht40_dev = NULL;
#endif  
   
   
    static bool read_sht40(int16_t *temp_c_x10, uint8_t *humidity_pct)
{
    if (!sht40_dev || !device_is_ready(sht40_dev)) {
        LOG_WRN("SHT40 not ready");
        return false;
    }

    int err = sensor_sample_fetch(sht40_dev);
    if (err) {
        LOG_WRN("SHT40 fetch failed: %d", err);
        return false;
    }

    struct sensor_value temp, hum;

    err = sensor_channel_get(sht40_dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
    if (err) {
        LOG_WRN("SHT40 temp get failed: %d", err);
        return false;
    }

    err = sensor_channel_get(sht40_dev, SENSOR_CHAN_HUMIDITY, &hum);
    if (err) {
        LOG_WRN("SHT40 humidity get failed: %d", err);
        return false;
    }

    /*
     * sensor_value { int32_t val1; int32_t val2; }
     * val1 = integer part, val2 = fractional part (millionths).
     * We store temperature × 10 for 0.1 °C resolution.
     *
     * Example: 23.56 °C → val1=23, val2=560000 → temp_c_x10 = 235
     */
    *temp_c_x10 = (int16_t)(temp.val1 * 10 + temp.val2 / 100000);

    /*
     * Humidity: clamp to 0–100 %, rounding to nearest integer.
     */
    int32_t hum_int = hum.val1;
    if (hum_int < 0)   hum_int = 0;
    if (hum_int > 100) hum_int = 100;
    *humidity_pct = (uint8_t)hum_int;

    LOG_INF("SHT40: temp=%d.%d °C  hum=%u %%",
            *temp_c_x10 / 10, abs(*temp_c_x10 % 10), *humidity_pct);

    return true;
}
   
   
   
    if (sht40_dev && device_is_ready(sht40_dev)) {
        LOG_INF("SHT40 ready on I2C — using as primary temperature source");
    } else {
        LOG_WRN("SHT40 not found — falling back to modem AT%%XTEMP?");
    }    

    /* Temporary — remove after confirming SHT40 is found */
    const struct device *i2c2_bus = DEVICE_DT_GET(DT_NODELABEL(i2c2));
    if (device_is_ready(i2c2_bus)) {
        LOG_INF("Scanning I2C2 bus...");
        for (uint8_t addr = 0x08; addr < 0x78; addr++) {
            uint8_t dummy;
            if (i2c_read(i2c2_bus, &dummy, 1, addr) == 0) {
                LOG_INF("  Found: 0x%02X", addr);
            }
        }
    } else {
        LOG_ERR("I2C2 bus not ready!");
    }

my overlay

    / {
    aliases {
        uart-bridge = &uart1;
        sht40 = &sht40;
    };
};

&uart1 {
    status = "okay";
    current-speed = <115200>;
};

&i2c2 {
    clock-frequency = <I2C_BITRATE_STANDARD>;
npm1300_pmic: pmic@6b {
compatible = "nordic,npm1300";
reg = <0x6b>;

npm1300_leds: leds {
compatible = "nordic,npm1300-led";
nordic,led0-mode = "host";
nordic,led1-mode = "host";
nordic,led2-mode = "host";
};

};
    sht40: sht40@44 {
        compatible = "sensirion,sht4x";
        reg = <0x44>;
        repeatability = <1>;
    };
};

in prj.conf

CONFIG_I2C=y
CONFIG_SENSOR=y
CONFIG_LIS2DH=y
CONFIG_SHT4X=y

on logs i am getting

[00:00:05.199,737] <inf> sensors: Scanning I2C2 bus…
[00:00:05.203,948] <inf> sensors: Found: 0×19
[00:00:05.222,747] <inf> sensors: Found: 0×6B
[00:00:05.225,524] <inf> sensors: Sensors: modem ready
[00:00:05.231,231] <err> SHT4X: Invalid CRC for RH.
[00:00:05.231,231] <err> SHT4X: Failed to fetch data.
[00:00:05.231,262] <wrn> sensors: SHT40 fetch failed: -5
[00:00:05.231,262] <wrn> sensors: SHT40 unavailable, falling back to modem temperature