AT86RF230_09 ATMEL [ATMEL Corporation], AT86RF230_09 Datasheet - Page 65

• Manufacturer Part Number: AT86RF230_09
• Description: Low Power 2.4 GHz Transceiver for ZigBee, IEEE 802.15.4, 6LoWPAN, RF4CE and ISM
• Manufacturer: ATMEL [ATMEL Corporation]

9.5.2 Data Interpretation
9.5.3 BATMON Interrupt Handling
9.5.4 Register Description
5131E-MCU Wireless-02/09
Bit
0x11
Read/Write
Reset value
Bit
0x11
Read/Write
Reset value
The signal bit BATMON_OK of register 0x11 (BATMON) indicates the current value of
the battery voltage:
• If BATMON_OK = 0, the battery voltage is lower than the threshold voltage
• If BATMON_OK = 1, the battery voltage is higher than the threshold voltage
After setting a new threshold, the value BATMON_OK should be read out to verify the
current supply voltage value.
Note, the battery monitor is inactive during P_ON and SLEEP states, see control
register 0x01 (TRX_STATUS).
A supply voltage drop below the programmed threshold value is indicated by the
BAT_LOW interrupt, see control register 0x0E and 0x0F. The interrupt is issued only if
BATMON_OK changes from 1 to 0.
No interrupt is generated when:
• The battery voltage is under the default 1.8V threshold at power up (BATMON_OK
• A new threshold is set, which is still above the current supply voltage (BATMON_OK
Noise or temporary voltage drops may generate unwanted interrupts when the battery
voltage is close to the programmed threshold voltage. To avoid this:
• Disable the IRQ_7 (BAT_LOW) in register 0x0E (IRQ_MASK) and treat the battery
• Set a lower threshold value.
Register 0x11 (BATMON)
The register BATMON configures the battery monitor. Additionally the supply voltage
status at pin 28 (EVDD) is accessible by reading register bit BATMON_OK according to
the actual BATMON settings.
• Bit [7:6] – Reserved
• Bit 5 – BATMON_OK
The register bit BATMON_OK indicates the level of the external supply voltage with
respect to the programmed threshold BATMON_VTH.
was never 1), or
remains 0).
as empty, or
R/W
R
7
0
3
0
Reserved
R/W
R
6
0
2
0
BATMON_VTH
BATMON_OK
R/W
R
5
0
1
1
BATMON_HR
R/W
R/W
AT86RF230
4
0
0
0
BATMON
BATMON
65