/* $NetBSD: nxp75areg.h,v 1.1 2026/06/03 11:08:41 jdc Exp $ */ /*- * Copyright (c) 2026 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Julian Coleman. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _DEV_I2C_NXP75AREG_H_ #define _DEV_I2C_NXP75AREG_H_ /* * *NXP* LM75A temperature sensor register definitions. * Pin compatible but not the same as the *TI* LM75A. */ #define NXP75A_ADDRMASK 0x3f8 #define NXP75A_ADDR 0x48 /* * Temperature on the NXP LM75A is represented by a 11-bit two's complement * word with the LSB equal to 0.125C. From the data sheet: * * +127C 011 1111 1000 0x3f8 * +126.875C 011 1111 0111 0x3f7 * +126.125C 011 1111 0001 0x3f1 * +125C 011 1110 1000 0x3e8 * +25C 000 1100 1000 0x9c8 * +0.125C 000 0000 0001 0x001 * 0C 000 0000 0000 0x000 * -0.125C 111 1111 1111 0x7ff * -25C 111 0011 1000 0x738 * -54.875C 110 0100 1001 0x649 * -55C 110 0100 1000 0x648 * * The bits are left-shifted to take the high 11 bits of the 2 registers. */ /* Command bits 0-2 select the register */ #define NXP75A_TEMP 0x00 #define NXP75A_CONFIG 0x01 #define NXP75A_THYST 0x02 #define NXP75A_OVERTEMP 0x03 /* Configuration register */ #define NXP75A_CONF_SHUTDOWN (1 << 0) /* Shutdown mode */ #define NXP75A_CONF_OS_MODE_INT (1 << 1) /* OS interrupt mode*/ #define NXP75A_CONF_OS_MODE_CMP (1 << 0) /* OS comparator mode*/ #define NXP75A_CONF_OS_POL_HIGH (2 << 1) /* OS polarity high */ #define NXP75A_CONF_OS_POL_LOW (2 << 0) /* OS polarity low */ #define NXP75A_CONF_OS_FLTQ_1 (0 << 3) /* OS fault queue len 1 */ #define NXP75A_CONF_OS_FLTQ_2 (1 << 3) /* OS fault queue len 2 */ #define NXP75A_CONF_OS_FLTQ_4 (2 << 3) /* OS fault queue len 4 */ #define NXP75A_CONF_OS_FLTQ_6 (3 << 3) /* OS fault queue len 6 */ #define NXP75A_TEMP_LEN 2 /* 2 bytes for temperatures */ #define NXP75A_CONF_LEN 1 /* 1 byte for configuration */ #endif /* _DEV_I2C_NXP75AREG_H_ */
