EM357-MOD-LR-ANT-TG Ember, EM357-MOD-LR-ANT-TG Datasheet - Page 145

• Manufacturer Part Number: EM357-MOD-LR-ANT-TG
• Description: MODULE EM357 PA/LNA W/ANT TG
• Manufacturer: Ember

Specifications of EM357-MOD-LR-ANT-TG

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 25mA
• Current - Transmitting: 42mA
• Data Interface: PCB, Surface Mount
• Memory Size: 192kB Flash, 12kB RAM
• Antenna Connector: On-Board, Chip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Applications: -
• Sensitivity: -
• Other names: 636-1020

An external incremental encoder can be connected directly to the MCU without external interface logic.
However, comparators are normally used to convert an encoder’s differential outputs to digital signals, and
this greatly increases noise immunity. If a third encoder output indicates the mechanical zero (or index)
position, it may be connected to an external interrupt input and can trigger a counter reset.
Figure 9-25 gives an example of counter operation, showing count signal generation and direction control. It
also shows how input jitter is compensated for when both inputs are used for counting. This might occur if the
sensor is positioned near one of the switching points. This example assumes the following configuration:
Counting on TI1
Counting on TI2
Counting on TI1
Active Edges
TIM_CC1S = 01 (TIMx_CCMR1 register, IC1FP1 mapped on TI1).
TIM_CC2S = 01 (TIMx_CCMR2 register, IC2FP2 mapped on TI2).
TIM_CC1P = 0 (TIMx_CCER register, IC1FP1 non-inverted, IC1FP1 = TI1).
TIM_CC2P = 0 (TIMx_CCER register, IC2FP2 non-inverted, IC2FP2 = TI2).
TIM_SMS = 011 (TIMx_SMCR register, both inputs are active on both rising and falling edges).
TIM_CEN = 1 (TIMx_CR1 register, counter is enabled).
and TI2
only
only
Figure 9-25. Example of Counter Operation in Encoder Interface Mode
Opposite Signal
(TI1FP1 for TI2,
TI2FP2 for TI1)
Level on
High
High
High
Low
Low
Low
Table 9-3. Counting Direction versus Encoder Signals
Final
No Count
No Count
9-21
Rising
Down
Down
Up
Up
TI1FP1 Signal
No Count
No Count
Falling
Down
Down
Up
Up
EM351 / EM357
No Count
No Count
Rising
Down
Down
Up
Up
TI2FP2 Signal
120-035X-000G
No Count
No Count
Falling
Down
Down
Up
Up