ROM2.1 the according command is supported in NMEA and SiRF OSP mode. After
a short delay the module will switch into hibernate mode. The RTC will keep on
running and SRAM is backed with the typical current of 60 µA drawn from Vcc. To
wake the module up again, toggling the ON_OFF pin is necessary (200ms pulse
width).
V1.0-Mar-14
User's Manual
Page 34 of 43