Per datasheet, "HIGH AND LOW LIMIT REGISTERS", the lower 4 bit of the limit registers are unused and always report 0. The lower 4 bit should not be used for temperature comparisons, so mask the unused bits before storing the limits.
Signed-off-by: Guenter Roeck <li...@roeck-us.net> --- hw/sensor/tmp105.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/sensor/tmp105.c b/hw/sensor/tmp105.c index 22728798f7..5fd30f8d50 100644 --- a/hw/sensor/tmp105.c +++ b/hw/sensor/tmp105.c @@ -166,7 +166,7 @@ static void tmp105_write(TMP105State *s) case TMP105_REG_T_HIGH: if (s->len >= 3) s->limit[s->pointer & 1] = (int16_t) - ((((uint16_t) s->buf[0]) << 8) | s->buf[1]); + ((((uint16_t) s->buf[0]) << 8) | (s->buf[1] & 0xf0)); tmp105_alarm_update(s); break; } -- 2.45.2