More than hundred sensor devices are required to monitor various body signals. The body area network (BAN) connecting the sensor devices with the controller needs low power consumption and real-time operations, which is difficult to implement by conventional controller chips. In this paper, a low power controller chip is designed and fabricated to manage the proposed network with low power consumption. It periodically monitors the data from maximum 255 sensor devices with less than 2-mW power consumption. The controller is implemented in 25 mm silicon area and its operation is successfully demonstrated on the test system board.