Data Sheet

LC840PA
Datasheet
https://www.lairdconnect.com
24
© Copyright 2021 Laird Connectivity
All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
Table 11: SPI power consumption
Parameter
Min
Typ
Max
Unit
With
DCDC (REG1)
With
LDO (REG1)
SPI Master Run current @ 2 Mbps
-
803
1040
-
uA
SPI Master Run current @ 8 Mbps
-
803
1040
-
uA
Idle current for SPI (no activity)
-
<1
<1
-
uA
SPI bit rate
-
-
8
Mbps
Table 12: I2C power consumption
Parameter
Min
Typ
Max
Unit
With
DCDC (REG1)
With
LDO (REG1)
I2C Run current @ 100 kbps
-
967
1250
-
uA
I2C Run current @ 400 kbps
-
967
1250
-
uA
Idle current for I2C (no activity)
-
3.2
3.2
-
uA
I2C Bit rate
100
-
400
kbps
Table 13: ADC power consumption
Parameter
Min
Typ
Max
Unit
With
DCDC (REG1)
With
LDO (REG1)
ADC current during conversion
-
1640
2010
-
uA
Idle current for ADC (no activity)
-
0
0
-
uA
The above current consumption is for the given peripheral including the internal blocks that are needed for that peripheral for
both the case when DCDC(REG1) is on and off. The peripheral Idle current is when the peripheral is enabled but not running
(not sending data or being used) and must be added to the LC840PA StandByDoze current (Nordic System ON Idle current).
In all cases radio is not turned on.
For asynchronous interface, like the UART (asynchronous as the other end can communicate at any time), the UART on the
LC840PA must be kept open (by a command in smartBASIC application script), resulting in the base current consumption
penalty.
For a synchronous interface like the I2C or SPI (since LC840PA side is the master), the interface can be closed and opened (by
a command in smartBASIC application script) only when needed, resulting in current saving (no base current consumption
penalty). There’s a similar argument for ADC (open ADC when needed).