MAX14914 no-OS driver#

Supported Devices#

MAX14914

Overview#

The MAX14914, MAX14914A and MAX14914B are the family of high-side/push-pull drivers that operate as both an industrial digital output (DO) and an industrial digital input (DI). The MAX14914 family features full IEC 61131-2 compliance in both their DO and DI modes of operation. The high-side switch current is resistor settable from 135mA (min) to 1.3A (min). The high-side driver’s on-resistance is 120mΩ (typ) at 125°C ambient temperature. Optional push-pull operation allows driving of cables and fast discharge of load capacitance. The output voltage is monitored and indicated through the DOI_LVL pin for safety applications.

Applications#

MAX14914#

  • Configurable Digital Input/Output

  • Industrial Digital Outputs and Inputs Modules

  • Motor Control

  • Safety Systems

MAX14914 Device Configuration#

Driver Initialization#

In order to use the device, you will have to provide the support for 5 GPIO pins:

  • FAULT

  • DOI_LVL

  • DI_EN

  • IN

  • PP

These pins will be initialized alongside the device using max14914_init API.

State Configuration#

The MAX14914 device can be set in the next 5 states using max14914_set_state API:

  • DIGITAL OUTPUT PUSH-PULL,

  • DIGITAL OUTPUT HIGH_SIDE,

  • DIGITAL OUTPUT LOW_SIDE,

  • DIGITAL INPUT IEC TYPE1/3,

  • DIGITAL INPUT IEC TYPE2

MAX14914 Driver Initialization Example#

struct max14914_desc *max14914_desc;
struct no_os_gpio_init_param max14914_fault_ip = {
        .port = 2,
        .pull = NO_OS_PULL_NONE,
        .number = 21,
        .platform_ops = &max_gpio_ops,
        .extra = &max14914_gpio_extra_ip,
};
struct no_os_gpio_init_param max14914_doilvl_ip = {
        .port = 1,
        .pull = NO_OS_PULL_NONE,
        .number = 0,
        .platform_ops = &max_gpio_ops,
        .extra = &max14914_gpio_extra_ip,
};
struct no_os_gpio_init_param max14914_di_en_ip = {
        .port = 1,
        .pull = NO_OS_PULL_NONE,
        .number = 1,
        .platform_ops = &max_gpio_ops,
        .extra = &max14914_gpio_extra_ip,
};
struct no_os_gpio_init_param max14914_in_ip = {
        .port = 1,
        .pull = NO_OS_PULL_NONE,
        .number = 2,
        .platform_ops = &max_gpio_ops,
        .extra = &max14914_gpio_extra_ip,
};
struct no_os_gpio_init_param max14914_pp_ip = {
        .port = 1,
        .pull = NO_OS_PULL_NONE,
        .number = 3,
        .platform_ops = &max_gpio_ops,
        .extra = &max14914_gpio_extra_ip,
};
struct max14914_init_param max14914_ip = {
        .di_en_init_param = &max14914_di_en_ip,
        .doilvl_init_param = &max14914_doilvl_ip,
        .fault_init_param = &max14914_fault_ip,
        .in_init_param = &max14914_in_ip,
        .pp_init_param = &max14914_pp_ip
};
ret = max14914_init(&max14914_desc, &max14914_ip);
if (ret)
        goto error;