CTL_A_PWRDN
chip->reg_control |= CTL_DA_IOM_DA | CTL_A_PWRDN;
chip->reg_control &= ~(CTL_DA_IOM_DA | CTL_A_PWRDN);
chip->reg_control |= CTL_A_PWRDN;
chip->reg_control = CTL_A_PWRDN | CTL_DA_ES2 |