EM357-RTR Ember, EM357-RTR Datasheet - Page 58

• Manufacturer Part Number: EM357-RTR
• Description: IC RF TXRX ZIGBEE 192KB 48QFN
• Manufacturer: Ember

Specifications of EM357-RTR

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 26mA
• Current - Transmitting: 31mA
• Data Interface: PCB, Surface Mount
• Memory Size: 192kB Flash, 12kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 636-1011-2

7.6
GPIO Modes
Timing for a power-on-reset is similar except that OSCHF does not begin oscillating until up to 70 µsec after
both core and HV supplies are valid. Combined with the maximum 250 µsec allowed for HV to ramp from 0.5 V
to 1.7 V, an additional 320 µsec may be added to the 512 OSCHF clocks until nBOOTMODE is sampled.
After nBOOTMODE has been sampled, PA5 is configured as a floating input like the other GPIO configurations.
The GPIO_BOOTMODE bit in the GPIO_DBGSTAT register captures the state of nBOOTMODE so that software
may act on this signal if required.
Note: To avoid inadvertently asserting nBOOTMODE, PA5’s capacitive load may not exceed 250 pF.
7.6.1
Analog mode enables analog functions, and disconnects a pin from the digital input and output logic. Only the
following GPIO pins have analog functions:
Note: When an external timing source is required, a 32.768 kHz crystal is commonly connected to PC6 and
PC7. Alternatively, when PC7 is configured as a digital input, PC7 can accept a digital external clock input.
When configured in analog mode:
PA4, PA5, PB5, PB6, PB7, and PC1 can be analog inputs to the ADC.
PB0 can be an external analog voltage reference input to the ADC, or it can output the internal analog
voltage reference from the ADC. The Ember software selects an internal or external voltage reference.
PC6 and PC7 can connect to an optional 32.768 kHz crystal.
The output drivers are disabled.
The internal pull-up and pull-down resistors are disabled.
The Schmitt trigger input is connected to a high logic level.
Reading GPIO_PxIN returns a constant 1.
Analog Mode
nBOOTMODE
nRESET
OSCHF
Figure 7-2. nBOOTMODE and nRESET Timing
26 µsec min.
Final
7-5
26 µsec min – 85 µsec max
512 clocks:
nBOOTMODE
. . .
. . .
. . .
sampled
EM351 / EM357
120-035X-000G